1. Columbia University Rare Book & Manuscript Library, MS X893.19 K71 no. 20 DS ID: DS18727 Title: Letter and Hebrew text Author: Zeʼev Wolf Pohrille Place: Ukraine Date: 1865.
2. Columbia University Rare Book & Manuscript Library, MS X893.19 K71 no. 5 DS ID: DS19610 Title: Letter and Hebrew text Author: Uri Schrage Feiwel HaLevi Schreier Place: Ukraine Date: 1864.