Specimen of Typography - An indication of Thomas’s engagement with his book collection is a bound volume of pasteboard sheets. At the foot of the first page is his inscription:  “Specimen of Typography about the year 1480. “These Leaves were pasted together to make Paste-board, which was used for the Cover of a book printed at Basil in 1547. The Leaves were separated by me in 1814. Thus we see how paste boards originated. I Thomas.” [view context of Thomas's note on the full page here].

The Amerian Antiquarian Society, 1812-2012 - A View at the Bicentennial
The Lengthened Shadow of a Man - Isaiah Thomas and the Founding of the American Antiquarian Society, 1812-1831