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.