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.