Brief Description: Correspondence with individuals, 1885-1936, including: Shmuel Alexandrovich, Isaak Antonovsky, Shlomo Bernstein, Martin Buber, Simon Goldlust, Shmuel Silberstein, Abraham Taub, Maxim Vinawer, Max Weinreich, Yehuda Leib Weisman, Chaim Zhitlowsky, Chaim Zuskind. Records of Jewish communities. Originals and copies of community registers (*pinkasim*), and other historical documents from Mstislavl, 1760-1895; Pinczow, 1632-1740; Piotrowice, 1726-1809; Stary Bykhow, 1686-1869; Tykocin, 1769-1777; Zabludow, 1650-1783; Birzai, 1755-1796; Dubno, 1670-1671; Lublin, 18th century; Miedzyrzec, 1816; Novaya Ushitsa, 1839-1840. Parts of the *pinkas* of the Council of Four Lands (Va-ad Arbah Aratsot). Historical documents relating to: restrictions and privileges issued by governments to Jewish populations; blood libel trials; Gzerot Takh-Tat (Chmielnicki massacres of 1648-49); documents from Russian Justice Ministry and Senate, 1799-1800. Materials on pogroms in the Russian empire, 1880-1907. Includes pogroms in Kishinev (1903), Gomel (1903), Bialystok (1906). Materials on Hasidism. Extracts of books, correspondence, documents by and about Hasidic rabbis and about Hasidism. Family papers. Includes family records of Rabbi Benzion Dubnow, grandfather of Simon Dubnow. General family correspondence.