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Thank you for contacting the History Hub regarding the War of 1812 in Vermont. I took a look at Fold3.com and there are a substantial number of records digitized for Colonel Isaac Clark in Vermont, including Letters Received by the Adjutant General’s Office. There also appears to be a pension record for Isaac T. Clark, Vermont infantry and heavy artillery. You may order pension records online or visit the National Archives in Washington D.C. to review the pension file in person.
There appears to be a substantial number of entries on Fold3.com for Valentine Goodrich as well.
I hope this information is helpful. Best of luck with your research!