1. Columbia University Rare Book & Manuscript Library, MS X893 Z8 v.2 no.1 DS ID: DS19277 Title: Responsa Author: Yaʻaḳov ben Meshulam Zalman Kortsman Place: Ukraine Date: 1865.
2. Columbia University Rare Book & Manuscript Library, MS X893 M587 DS ID: DS19594 Title: Responsa Place: Turkey Date: 1803.