Magnetic sound tapes of interviews with Angelika Balabanoff. The tapes were made in 1958, apparently for Radio Liberty. They are labeled as follows: "Korolestvo lzhi" (two reels); "Ob internatsionale" (two reels); "O Lenine" (three reels); "O Mussolini i Zinov'eve" (two reels); "O Staline" (two reels); "Serrati, Reed" (two reels).

The papers comprise correspondence, documents, institutional files, writings, lectures, memoirs, research notes, photographs, third party materials, printed materials, periodicals, microfilms, audio material, and digital files accrued by historian and professor emeritus of Columbia University, Leopold H. Haimson, during his professional life.

Notes, manuscripts, and clippings used by Raphael Abramovitch in the preparation of his book, The Soviet Revolution, 1917-1939 (New York, 1962). There are chapter drafts, notes, Russian newspaper clippings, and manscripts by other persons. Among the last are two manuscripts by Boris L. Dvinov on the opposition in the Soviet Communist Party and on Soviet-German relations. Related to several BAR collections, including Leopold Haimson papers.