The Private Archives of Simon Dubnow
The Dubnow Institute Library contains a unique historical documentation on Jewish history on microfiche, collected by Simon Dubnow beginning in 1890. This Dubnow Collection from the YIVO Institute (NYC) is the private archive of the historian Simon Dubnow. It consists primarily of the following materials as listed below, in Russian, Yiddish, Hebrew, and to a much smaller extent in English, German and Spanish.
Historical documents on state restrictions and privileges pertaining to the Jewish population, such as ritual murder trials and papers from the Russian Justice Ministry around 1800
Documents on Hasidism and Hasidic rabbis
Family papers of various origin, from Dubnow's grandfather Rabbi Benzion Dubnow and other general family letters
Correspondence with various personalities (incl. Maxim Winawer, Max Weinreich, Chaim Zhitlowsy, Martin Buber)
Personal notes on political events, historical sources, meetings, etc.