Brief Description: Correspondence with literary, artistic and communal figures: Shalom Asch, Baal Makhshoves (Isidore Eliashev), David Bergelson, Martin Buber, Marc Chagall, Simon Dubnow, Itsik Feffer, Lion Feuchtwanger, Aaron Glanz-Leieles, Jacob Glatstein, Shmuel Halkin, Itzik Kipnis, Leib Kvitko, H. Leivick, Itzik Manger, Peretz Markish, Shmuel Niger, David Pinsky, Noah Prylucki, Melech Ravitch, Abraham Reisen, Zalman Reisen, Zalman Shneur, Sholem Aleichem, Nahum Shtif, Israel Joshua Singer, Isaac Nachman Steinberg, Abraham Sutzkever, Baruch Vladeck, Max Weinreich, Yehoash, Israel Zangwill, Aaron Zeitlin, Hillel Zeitlin, Chaim Zhitlowsky. Correspondence with organizations. Family correspondence. Personal documents. Lectures, 1921-1951, by Opatoshu on the works of I.L. Peretz, H. Leivick, H.D. Nomberg and various other topics. Manuscripts of stories, fragments of novels, dramatizations. Press clippings of Opatoshu's stories in Yiddish and Hebrew, reviews of his works, reports of his travels to Soviet Russia. Manuscripts of other authors, including Jacob Shatzky, Shmuel Niger, Yechiel Yeshaia Trunk. Materials on Mlawa, Poland including statistical data, maps, memorabilia, memoirs. Photographs of Opatoshu, his family and friends. Reproductions of drawings.