Isaac C Glasko

Biography
Isaac C. Glasko was born ca. 1776, and died on September 2, 1861. He was the son of Jacob Glasko and Matilda (Unknown).

A native of Rhode Island, he settled with his family in North Uxbridge, Massachusetts by 1790, where he became a blacksmith and, in 1806, purchased land with his brother George Glasko from Alexander Stewart in Griswold, Connecticut. The land was along the Pachaug River, according to Preston land records bounded by a dam and an old Iron works; the transaction included the right to open the dam and to divert water for use in his blacksmithing business. 

He received, in 1807, a third of the 50 acres that his father had acquired in Griswold, Connecticut.

He continued to work as a blacksmith in Griswold, Connecticut, constructing a water-powered trip hammer forge. He initially produced tools for local farmers and later tools for the shipping and whaling industries. Very successful, his business grew to 10 employees.

In 1823, with his friend, Pero Moodey, he petitioned the Connecticut General Assembly for an exemption from taxation, arguing that, because they were unable to vote, they should not be required to pay taxes. The petition was read to a select committee, but the legislature rejected the petition.

In 1841, in declining health and with some financial issues, he sold off land to satisfy his debts.

He was a respected member of the community and the town of Glasgo is named in his honor.
 
His surname appears with number of variations in the public records: Glasko, Glasco, Glassko,, Glassgo, Glassgow, Glasse, Glasgo. 

Isaac Glasko was born around 1776 in Cumberland, Rhode Island to Jacob Glasko and Lucy Brayton Glasko. He was of both Native American and African American Heritage. He married Lucy Brayton of Smithfield. Griswold, Connecticut, About Our Town, Griswold's Past (https://www.griswold-ct.org/about_our_town/index.php#:~:text=Tool%20Inventor%20Isaac%20Glasko%2C%20a,name%20now%20known%20as%20Glasgo.) After King Philip's War: Presence and Persistence in Indian New England edited by Colin G. Calloway (https://www.google.com/books/edition/After_King_Philip_s_War/LXrgK29zl2QC?hl=en&gbpv=1&dq=Isaac+Glasko&pg=PT344&printsec=frontcover) African American Historic Burial Grounds and Gravesites of New England By Glenn A. Knoblock (https://www.google.com/books/edition/African_American_Historic_Burial_Grounds/R-07CwAAQBAJ?hl=en&gbpv=1&dq=Isaac+Glasko&pg=PA167&printsec=frontcover) 
Children:
# Azubah born 1810, may have died young
# Isaac Moodey Glasko (1813-abt.1877) named in part after Isaac's friend Pero Moody 
# Eliza Glasko 
# Miranda (Glasko) Overbaugh (abt.1820-abt.1894)

Isaac, widowed, died (age 85) on 2 September 1861 in Guilford, New Haven, Connecticut, United States. 
Death:
"Connecticut, Charles R. Hale Collection, Vital Records, 1640-1955" 
citing Page: 92; Digital film/folder number: 007592418; FHL microfilm: 3336; Image number: 101; Record number: 10; Packet letter: J; Indexing batch: B03738-6 
 (accessed 8 February 2026) 
 
Isaac C Glasko death 2 Sep 1861 (age 85) in Guilford, New Haven, Connecticut, United States.
 
Death:
"Connecticut, Deaths and Burials, 1772-1934" 
citing Digital film/folder number: 007616164; FHL microfilm: 1311436; Record number: 740; Packet letter: A 
 (accessed 8 February 2026) 
Isaac Glasko death 2 Sep 1861 (age 85) in Norwich, New London, Connecticut, United States.
 Isaac was mentioned on a memorial at Old Kinne Burying Ground, Griswold, New London County, Connecticut, United States, with a death date of 2 September 1861. 
Memorial:
Find a Grave (has image) 
 (accessed 8 February 2026) 
Memorial page for Isaac C Glasko (unknown-2 Sep 1861), citing Old Kinne Burying Ground, Griswold, New London County, Connecticut, USA; Maintained by John Beckstein (contributor 46939506).
History
The village of Glasgo in Griswold, Connecticut is named for Isaac Glasko. The misspelling is due to a post office clerical error. 

By 1800 he and his wife had relocated to North Uxbridge, Massachusetts in the Blackstone Valley. His father Jacob and brother George followed him and also moved to the Blackstone Valley. 

In 1806 Isaac, his father and brother moved to Griswold Connecticut. Isaac purchased from Alexander Stewart (also a member of the Kinne family) three-quarters of an acre of land and a house, along with the rights to water-power access from the dam where Stewart had a grist-mill. That same year, Jacob Glasko (still of Massachusetts) purchased fifty acres of land and a house along the Pachaug River and by the edge of a pond (now Glasgo Pond) for $1,250, a third of which holdings he sold to each of his sons in 1807. 

Issac established a business as a blacksmith and grew it into a commercial forge employing as many as 10 blacksmiths manufacturer producing farming implements as well as harpoons for the whaling industry, among other things. His blacksmith shop was constructed near the what is now the intersection of Route 165 and Route 201. He harnessed waterpower to a large mechanical trip hammer that sped the manufacturing process and enabled him to make large tools. 

The Glaskos were active in buying and selling land in the area. Isaac owned 54 acres. By 1841, he owned at least 54 acres of land with four dwelling houses, a sawmill, a gristmill, two barns, a coal house, and a number of other small outbuildings. 

Isaac Glasko and his friend Pero Moody (1750-1830) filed a petition in 1823 to teh Connecticut General Assembly requesting exemption from taxation on the grounds that they could not vote. In part, the petition states that they were "descendants of African Citizens brought to this County against their will" and that "in the midst of most mortifying discouragement have acquired some property" Rejected Bills, Connecticut State Legislature, Records Group 002, Box 2, Folder 3). Connecticut History Blacksmith Isaac Glasko Challenges the State Constitution (https://connecticuthistory.org/blacksmith-isaac-glasko-challenges-the-state-constitution/) 

 Isaac's daughter, Eliza Glasko attended Prudence Crandall's academy for young ladies in Canterbury from 1833-34, which is thought to be one of the first integrated schools. 

 His house still stands, although it has been considerably altered. Isaac Glasko final resting place with his wife are in a quiet burying ground near the center of the village that now bears his name now known as Glasgo. 
Census Records
In the 1820 census Isaac was in Griswold, New London, Connecticut, United States. 
1820 Census:
"United States, Census, 1820" 
citing Page: 729; Affiliate Name: The U.S. National Archives and Records Administration (NARA); Affiliate Publication Number: M33; Digital film/folder number: 005157044; FHL microfilm: 0281235; Image number: 717 
 (accessed 8 February 2026) 
 
Isaac Glasko in Griswold, New London, Connecticut, United States.
{| border="1" cellpadding="4"
|+ 1820 United States Federal Census: Griswold, New London, Connecticut
|- bgcolor=#E1F0B4
| Name
|-
| Isaac Glasko
|}

In the 1840 census Isaac was in Griswold, New London, Connecticut, United States. 
1840 Census:
"United States, Census, 1840" 
citing Page: 252; Affiliate Name: The U.S. National Archives and Records Administration (NARA); Affiliate Publication Number: M704; Digital film/folder number: 005154501; FHL microfilm: 0003022; Image number: 510 
 (accessed 11 February 2026) 
 
Isaac C Glasko in Griswold, New London, Connecticut, United States.
{| border="1" cellpadding="4"
|+ 1840 United States Federal Census: Griswold, New London, Connecticut
|- bgcolor=#E1F0B4
| Name
|-
| Isaac C Glasko
|}

In the 1850 census Isaac (age 73) was in Griswold, New London, Connecticut, United States. 
1850 Census:
"United States, Census, 1850" 
citing Affiliate Name: The U.S. National Archives and Records Administration (NARA); Affiliate Publication Number: M432; Line: 41; Digital film/folder number: 004181039; FHL microfilm: 442881; Image number: 244; Record number: 9967; Packet letter: A; Indexing batch: N00957-9 
 (accessed 8 February 2026) 
 
Isaac C Glasko (73) in Griswold, New London, Connecticut, United States. Born in Rhode Island. 
{| border="1" cellpadding="4"
|+ 1850 United States Federal Census: Griswold, New London, Connecticut
|- bgcolor=#E1F0B4
| Name || Sex || Age || Occupation || Birth Place
|-
| Isaac C Glasko || M || 73 || || Rhode Island
|-
| Miranda Glasko || F || 31 || || Connecticut
|-
| Mary J James || F || 12 || || Connecticut
|}
Sources
* "Rhode Island Marriages, 1724-1916", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F8KY-ZQ9: 22 January 2020), Lucy Brayton in entry for Isaac Glasco, 1800.

* "Connecticut Births and Christenings, 1649-1906", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F74M-K8K: 7 January 2020), Isaac Glasko in entry for Isaac Moodey Glasko, 1813.

* "United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M68T-KC5: 19 December 2020), Isaac C Glasko, Griswold, New London, Connecticut, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).

* "Connecticut, Charles R. Hale Collection, Vital Records, 1640-1955", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:F76T-H6X: 16 September 2020), Isaac C. Glasko, 1861.

* Glenn A. Knoblock, African American Historic Burial Grounds and Gravesites of New England (Jefferson, North Carolina: McFarland & Co.; 2015), pp. 167-168.

* "Blacksmith Isaac Glasko Challenges the State Constitution," Connecticut History (April 16, 2021), https://connecticuthistory.org/blacksmith-isaac-glasko-challenges-the-state-constitution/.

* "Glasgo: Isaac Glasko Forges a Life," Connecticut Explored (2016), https://www.ctexplored.org/glasgo-isaac-glasko-forges-a-life/.

* "Nine New England Tax Resisters," New England Historical Society (2021), https://www.newenglandhistoricalsociety.com/nine-new-england-tax-resisters/.
* “Glasgo Village.” 2016. Connecticut Freedom Trail. http://www.ctfreedomtrail.org/trail/concept-of-freedom/sites/#!/glasgo-village.
*“The Indian & Colonial Research Center.” 2016. http://indianandcolonial.org/.
* Knoblock, Glenn A. 2015. African American Historic Burial Grounds and Gravesites of New England. Jefferson, NC: McFarland & Company, Inc.
* Calloway, Colin G. 1997. After King Philip’s War: Presence and Persistence in Indian New England. Hanover, NH: University Press of New England.
* Kimball, Carol W. 1999. “Blacksmith Isaac Glasko Left His Mark on the Region.” The Day. https://news.google.com/newspapers?id=xA8hAAAAIBAJ&sjid=xnYFAAAAIBAJ&pg=1696%2C4716245.
* Connecticut State Agricultural Society. 1855. 23 Transactions of the Conn. State Agricultural Society, for the Year 1854. Hartford, CT: State of Connecticut. http://hdl.handle.net/2027/coo.31924065168191?urlappend=%3Bseq=933.
* Adams, George. 1856. The Connecticut Business Directory, Giving the Names and Post Office Addresses of Merchants, Manufacturers, and Professional Men... Boston, MA: Briggs & Co. http://hdl.handle.net/2027/hvd.hn4gmn?urlappend=%3Bseq=67.
* Normen, Elizabeth J., ed. 2013. African American Connecticut Explored. Middletown, CT: Wesleyan University Press.
* "Find A Grave Index," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QV2D-KXC9: 5 August 2020), Isaac C Glasko, ; Burial, Griswold, New London, Connecticut, United States of America, Old Kinne Burying Ground; citing record ID 69999888, Find a Grave, http://www.findagrave.com.
* Find a Grave, database and images (https://www.findagrave.com/memorial/69999888/isaac_c-glasko: accessed March 22, 2026), memorial page for Isaac C Glasko (unknown–2 Sep 1861), Find a Grave Memorial ID 69999888, citing Old Kinne Burying Ground, Griswold, New London County, Connecticut, USA; Maintained by John Beckstein (contributor 46939506).

[[Category:Griswold, Connecticut]]
[[Category:Connecticut, Free People of Color]]
[[Category:Massachusetts, Free People of Color]]
[[Category:Rhode Island, Free People of Color]]
[[Category:USBH Free People of Color, Linked]]
[[Category:Old Kinne Burying Ground, Griswold, Connecticut]]
== Biography == 
{{African-American Sticker}}
{{Heritage Sticker|ancestors=Native American}}
{{Occupation |image=Black_Heritage_Sticker_Images-5.png|text=was a blacksmith.}}

Isaac C. Glasko was born ca. 1776, and died on September 2, 1861.   He was the son of [[Glasko-5 | Jacob Glasko]] and Matilda (Unknown).

A native of Rhode Island, he settled with his family in North Uxbridge, Massachusetts by 1790, where he became a blacksmith and, in 1806, purchased land with his brother George Glasko from Alexander Stewart in Griswold, Connecticut.  The land was along the Pachaug River, according to Preston land records bounded by a dam and an old Iron works; the transaction included the right to open the dam and to divert water for use in his blacksmithing business. 

He received, in 1807, a third of the 50 acres that his father had acquired in Griswold, Connecticut.

He continued to work as a blacksmith in Griswold, Connecticut, constructing a water-powered trip hammer forge.  He initially produced tools for local farmers and later tools for the shipping and whaling industries.  Very successful, his business grew to 10 employees.

In 1823, with his friend, Pero Moodey, he petitioned the Connecticut General Assembly for an exemption from taxation, arguing that, because they were unable to vote, they should not be required to pay taxes.  The petition was read to a select committee, but the legislature rejected the petition.

In 1841, in declining health and with some financial issues, he sold off land to satisfy his debts.

He was a respected member of the community and the town of Glasgo is named in his honor.
 
His surname appears with  number of variations in the public records: Glasko, Glasco, Glassko,, Glassgo, Glassgow, Glasse, Glasgo. 

Isaac Glasko was born around 1776 in Cumberland, Rhode Island to Jacob Glasko and Lucy Brayton Glasko.  He was of both Native American and African American Heritage. He married Lucy Brayton of Smithfield. <ref name="Griswold">[https://www.griswold-ct.org/about_our_town/index.php#:~:text=Tool%20Inventor%20Isaac%20Glasko%2C%20a,name%20now%20known%20as%20Glasgo. Griswold, Connecticut, About Our Town, Griswold's Past]</ref> <ref name="PhillipsWar"> [https://www.google.com/books/edition/After_King_Philip_s_War/LXrgK29zl2QC?hl=en&gbpv=1&dq=Isaac+Glasko&pg=PT344&printsec=frontcover After King Philip's War: Presence and Persistence in Indian New England edited by Colin G. Calloway]</ref> <ref name="BurialGrounds">[https://www.google.com/books/edition/African_American_Historic_Burial_Grounds/R-07CwAAQBAJ?hl=en&gbpv=1&dq=Isaac+Glasko&pg=PA167&printsec=frontcover African American Historic Burial Grounds and Gravesites of New England By Glenn A. Knoblock]</ref>
Children:
# Azubah born 1810, may have died young
# [[Glasko-3|Isaac Moodey Glasko (1813-abt.1877)]] named in part after Isaac's friend Pero Moody 
# Eliza Glasko <ref name="Griswold"/>
# [[Glasko-8|Miranda (Glasko) Overbaugh (abt.1820-abt.1894)]]

Isaac, widowed, died (age 85) on 2 September 1861 in Guilford, New Haven, Connecticut, United States.<ref>
'''Death''':
"Connecticut, Charles R. Hale Collection, Vital Records, 1640-1955"<br/>
citing Page: 92; Digital film/folder number: 007592418; FHL microfilm: 3336; Image number: 101; Record number: 10; Packet letter: J; Indexing batch: B03738-6<br/>
{{FamilySearch Record|F7NX-LXR}} (accessed 8 February 2026)<br/>
{{FamilySearch Image|3QS7-L9F5-SGHY}}<br/>
Isaac C Glasko death 2 Sep 1861 (age 85) in Guilford, New Haven, Connecticut, United States.
</ref> <ref>
'''Death''':
"Connecticut, Deaths and Burials, 1772-1934"<br/>
citing Digital film/folder number: 007616164; FHL microfilm: 1311436; Record number: 740; Packet letter: A<br/>
{{FamilySearch Record|F7KJ-94F}} (accessed 8 February 2026)<br/>
Isaac Glasko death 2 Sep 1861 (age 85) in Norwich, New London, Connecticut, United States.
</ref> Isaac was mentioned on a memorial at Old Kinne Burying Ground, Griswold, New London County, Connecticut, United States, with a death date of 2 September 1861.<ref>
'''Memorial''':
Find a Grave (has image)<br/>
{{FindAGrave|69999888}} (accessed 8 February 2026)<br/>
Memorial page for Isaac C Glasko (unknown-2 Sep 1861), citing Old Kinne Burying Ground, Griswold, New London County, Connecticut, USA; Maintained by John Beckstein (contributor 46939506).
</ref>
=== History ===
The village of Glasgo in  Griswold, Connecticut is named for Isaac Glasko.  The misspelling is due to a post office clerical error. <ref name="Griswold"/>

By 1800 he and  his wife had relocated to North Uxbridge, Massachusetts in the Blackstone Valley. His father Jacob and brother George followed him and also moved  to the Blackstone Valley. <ref name="PhillipsWar"/> 

In 1806 Isaac, his father and brother moved to Griswold Connecticut. Isaac purchased from Alexander Stewart (also a member of the Kinne family) three-quarters of an acre  of land and a house, along with the rights to water-power access from the dam where Stewart had a grist-mill. That same year, Jacob Glasko (still of Massachusetts) purchased fifty acres of land and a house along the Pachaug  River and by the edge of a pond (now Glasgo Pond) for $1,250, a third of which holdings  he sold to each of his sons in 1807. <ref name="BurialGrounds"/>

Issac established a business as a blacksmith and grew it into a commercial forge  employing  as many as  10 blacksmiths manufacturer producing farming implements as well as harpoons for the whaling industry, among other things. His blacksmith shop was constructed near the what is now the intersection of Route 165 and Route 201. He harnessed waterpower to a large mechanical trip hammer  that sped the manufacturing process and enabled him to make large tools. <ref name="Griswold"/><ref name="ConnHistory"/>

The Glaskos were  active in buying and selling land in the area. Isaac owned 54 acres.  By 1841, he owned at least 54 acres of land with four dwelling houses, a sawmill, a gristmill, two barns, a coal house, and a number of other small outbuildings. <ref name="BurialGrounds"/>

Isaac Glasko and his friend Pero Moody (1750-1830) filed a petition in 1823 to teh Connecticut General Assembly requesting exemption from taxation on the grounds that they could not vote. In part, the petition states that they were "descendants of African Citizens brought to this County against their will" and that "in the midst of most mortifying discouragement have  acquired some property"  <ref>Rejected  Bills,  Connecticut State Legislature, Records Group  002, Box 2, Folder 3).</ref> <ref name="BurialGrounds"/> <ref name="ConnHistory">[https://connecticuthistory.org/blacksmith-isaac-glasko-challenges-the-state-constitution/ Connecticut History Blacksmith Isaac Glasko Challenges the State Constitution]</ref>

 Isaac's daughter, Eliza Glasko attended Prudence Crandall's academy for young ladies in Canterbury from 1833-34, which is  thought  to be one of the first integrated schools.<ref name="Griswold"/>

 His house still stands, although it has been considerably altered.  Isaac Glasko final resting place with his  wife are in a quiet burying ground near the center of the village that now bears his name now known as Glasgo.<ref name="Griswold"/>
== Census  Records ==
In the 1820 census Isaac was in Griswold, New London, Connecticut, United States.<ref>
'''1820 Census''':
"United States, Census, 1820"<br/>
citing Page: 729; Affiliate Name: The U.S. National Archives and Records Administration (NARA); Affiliate Publication Number: M33; Digital film/folder number: 005157044; FHL microfilm: 0281235; Image number: 717<br/>
{{FamilySearch Record|XHL6-YG3}} (accessed 8 February 2026)<br/>
{{FamilySearch Image|33SQ-GYBS-63H}}<br/>
Isaac Glasko in Griswold, New London, Connecticut, United States.
{| border="1" cellpadding="4"
|+ 1820 United States Federal Census: Griswold, New London, Connecticut
|- bgcolor=#E1F0B4
| Name
|-
| '''Isaac Glasko'''
|}
</ref>

In the 1840 census Isaac was in Griswold, New London, Connecticut, United States.<ref>
'''1840 Census''':
"United States, Census, 1840"<br/>
citing Page: 252; Affiliate Name: The U.S. National Archives and Records Administration (NARA); Affiliate Publication Number: M704; Digital film/folder number: 005154501; FHL microfilm: 0003022; Image number: 510<br/>
{{FamilySearch Record|XHBC-7D2}} (accessed 11 February 2026)<br/>
{{FamilySearch Image|33SQ-GYYT-LRM}}<br/>
Isaac C Glasko in Griswold, New London, Connecticut, United States.
{| border="1" cellpadding="4"
|+ 1840 United States Federal Census: Griswold, New London, Connecticut
|- bgcolor=#E1F0B4
| Name
|-
| '''Isaac C Glasko'''
|}
</ref>

In the 1850 census Isaac (age 73) was in Griswold, New London, Connecticut, United States.<ref name="1850C">
'''1850 Census''':
"United States, Census, 1850"<br/>
citing Affiliate Name: The U.S. National Archives and Records Administration (NARA); Affiliate Publication Number: M432; Line: 41; Digital film/folder number: 004181039; FHL microfilm: 442881; Image number: 244; Record number: 9967; Packet letter: A; Indexing batch: N00957-9<br/>
{{FamilySearch Record|M68T-KC5}} (accessed 8 February 2026)<br/>
{{FamilySearch Image|S3HY-67ZS-LGD}}<br/>
Isaac C Glasko (73) in Griswold, New London, Connecticut, United States. Born in Rhode Island. </ref>
{| border="1" cellpadding="4"
|+ 1850 United States Federal Census: Griswold, New London, Connecticut
|- bgcolor=#E1F0B4
| Name || Sex || Age || Occupation || Birth Place
|-
| '''Isaac C Glasko''' || '''M''' || '''73''' ||  || '''Rhode Island'''
|-
| Miranda Glasko || F || 31 ||  || Connecticut
|-
| Mary J James || F || 12 ||  || Connecticut
|}
== Sources ==
<references />
* "Rhode Island Marriages, 1724-1916", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F8KY-ZQ9: 22 January 2020), Lucy Brayton in entry for Isaac Glasco, 1800.

* "Connecticut Births and Christenings, 1649-1906", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F74M-K8K: 7 January 2020), Isaac Glasko in entry for Isaac Moodey Glasko, 1813.

* "United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M68T-KC5: 19 December 2020), Isaac C Glasko, Griswold, New London, Connecticut, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).

* "Connecticut, Charles R. Hale Collection, Vital Records, 1640-1955", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:F76T-H6X: 16 September 2020), Isaac C. Glasko, 1861.

* Glenn A. Knoblock, ''African American Historic Burial Grounds and Gravesites of New England'' (Jefferson, North Carolina: McFarland & Co.; 2015), pp. 167-168.

* "Blacksmith Isaac Glasko Challenges the State Constitution," Connecticut History (April 16, 2021), https://connecticuthistory.org/blacksmith-isaac-glasko-challenges-the-state-constitution/.

* "Glasgo: Isaac Glasko Forges a Life," Connecticut Explored (2016), https://www.ctexplored.org/glasgo-isaac-glasko-forges-a-life/.

* "Nine New England Tax Resisters," New England Historical Society (2021), https://www.newenglandhistoricalsociety.com/nine-new-england-tax-resisters/.
* “Glasgo Village.” 2016. Connecticut Freedom Trail. http://www.ctfreedomtrail.org/trail/concept-of-freedom/sites/#!/glasgo-village.
*“The Indian & Colonial Research Center.” 2016. http://indianandcolonial.org/.
* Knoblock, Glenn A. 2015. African American Historic Burial Grounds and Gravesites of New England. Jefferson, NC: McFarland & Company, Inc.
* Calloway, Colin G. 1997. After King Philip’s War: Presence and Persistence in Indian New England. Hanover, NH: University Press of New England.
* Kimball, Carol W. 1999. “Blacksmith Isaac Glasko Left His Mark on the Region.” The Day. https://news.google.com/newspapers?id=xA8hAAAAIBAJ&sjid=xnYFAAAAIBAJ&pg=1696%2C4716245.
* Connecticut State Agricultural Society. 1855. 23 Transactions of the Conn. State Agricultural Society, for the Year 1854. Hartford, CT: State of Connecticut. http://hdl.handle.net/2027/coo.31924065168191?urlappend=%3Bseq=933.
* Adams, George. 1856. The Connecticut Business Directory, Giving the Names and Post Office Addresses of Merchants, Manufacturers, and Professional Men... Boston, MA: Briggs & Co. http://hdl.handle.net/2027/hvd.hn4gmn?urlappend=%3Bseq=67.
* Normen, Elizabeth J., ed. 2013. African American Connecticut Explored. Middletown, CT: Wesleyan University Press.
* "Find A Grave Index," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QV2D-KXC9: 5 August 2020), Isaac C Glasko, ; Burial, Griswold, New London, Connecticut, United States of America, Old Kinne Burying Ground; citing record ID 69999888, Find a Grave, http://www.findagrave.com.
* Find a Grave, database and images (https://www.findagrave.com/memorial/69999888/isaac_c-glasko: accessed March 22, 2026), memorial page for Isaac C Glasko (unknown–2 Sep 1861), Find a Grave Memorial ID 69999888, citing Old Kinne Burying Ground, Griswold, New London County, Connecticut, USA; Maintained by John Beckstein (contributor 46939506).