Correspondence with individuals including Shlomo Bickel, Salo Baron, Oscar Handlin, Abraham Joshua Heschel, Judah A. Joffe, Guido Kisch, Moses Rischin, Emanuel Ringelblum, Max Weinreich.      Manuscripts of writings.  Studies of the Jewish lower classes in Germany, and of their slang, including "Social-geschichte der niedern judischen volkes in deutschland" (Social History of the Jewish Lower Class in Germany) and its English translation.  Studies of Jewish immigration to the U.S.; German Jews in the U.S.; Jews in California, Alaska, and other states.  Studies of Jews and Irish, Jews and Chinese, Jews and Mormons.  Studies on philosemitism.  Source materials on American Jewish history. Clippings about Glanz.  Personal documents.  Copy of dissertation titled "The Jews of Montana" by  Benjamin Kelson.      Correspondence with organizations: American Jewish Historical Society; Emergency Committee in Aid of Displaced Foreign Scholars; Farband (Labor Zionist Order); Jewish Publication Society of America; Jewish Teachers' Seminary (New York); Jewish Theological Seminary (New York); Leo Baeck Institute; Library of Congress; YIVO.

(collection addendum, 1/03) Galley proofs of book written by RG:"Aspects of Social, Political and Economic History of the Jews in America"; personal history of RG's early life in Vienna and Vilna; genealogical information and family tree