1. Columbia University Rare Book & Manuscript Library, MS X893.19 K71 DS ID: DS18717 Title: Letter and Hebrew text Author: Yeshaʻyah Naftali Herts Shapira Place: Poland Date: 18--
2. Columbia University Rare Book & Manuscript Library, MS X893 R273 DS ID: DS19830 Title: Hebrew texts Author: Jakob Reifmann Place: Poland Date: 18--