1. Columbia University Rare Book & Manuscript Library, MS X893.19 K71 no. 13 DS ID: DS18723 Title: Letter and Hebrew text Author: Jacob Jacobke Heilprin Place: Ukraine Date: 1865.
2. Columbia University Rare Book & Manuscript Library, MS X893.19 K71 no. 15 DS ID: DS18725 Title: Letter and Hebrew text Author: Shemuʼel Yitsḥaḳ Shor Place: Ukraine Date: 1865.