Membership Certificate - Isaiah Thomas signed the 1827 membership certificate of Christopher Columbus Baldwin. Thomas commissioned the engraving for the diploma from Abner Reed in 1819. This engraving is still used on membership certificates, although the plate that showed signs of wear by the late nineteenth century has been lost, and a photographic reproduction substituted.
The Amerian Antiquarian Society, 1812-2012 - A View at the Bicentennial
A Palmy State of Prosperity - Christopher Columbus Baldwin, 1831-1837 & Maturin L. Fisher, Interim Appointment