1. Columbia University Rare Book & Manuscript Library, MS X893 H26 DS ID: DS19006 Title: Epistles and Calendar Author: Abraham Firkovich Place: undetermined Date: 1860.
2. Columbia University Rare Book & Manuscript Library, MS X893 F51 DS ID: DS19704 Title: Letter and Hebrew text Author: Abraham Firkovich Place: Karasu and Turkey Date: 1846.