Correspondence, manuscripts, photographs, memorabilia, and printed materials concerning Berg's lifelong interest in and work for his alma mater. Berg served the University in many capacities such as vice-president and president of the Alumni Association of Columbia College, 1954-1958, and member of the board of directors of the Alumni Federation of Columbia University, 1946-1958. The correspondence deals chiefly with alumni affairs; some of the major correspondents include Harry J. Carman, Lawrence Chamberlain, Frank S. Hogan, Mr & Mrs Richard Rodgers, and Arthur Hays Sulzberger. Among the photographs are two signed by Dwight D. Eisenhower. Also included is a typescript memoir of Berg's three years as a student in the Columbia School of Law (1927). Berg collaborated with three other students on this memoir. Aaron Berg's correspondence with Dwight D. Eisenhower is at the Eisenhower Library. Also included are literary autographs and manuscripts purchased on the Aaron Berg Fund.

Manuscripts of Mikhail I. Nilśkiĭ (probably a pseudonym), include a typescript memoir"Pobeg" (266 p.), which describes the author's experiences in Soviet labor camps. Also included are 40 short sketches, paginated consecutively, covering political prisons and camps and episodes from the lives of Soviet citizens, such as encounters with the NKVD, escape from the Nazis during World War II, and court trials.

Papers consist of correspondence, manuscripts, and printed materials. Correspondents include Nadezhda Teffi and Pierre Fresnay. There are manuscripts of stories, novels, plays, scenarios, and memoirs by Oks. Oks' memoirs touch on his legal career in Russia and meetings with Sarah Bernhardt and Fedor Shali︠a︡pin; the memoirs of his wife, Lidii︠a︡ Borshch, concern the period of the Revolution and Civil War in Russia and meetings with Maksim Gorḱiĭ in Italy in the 1920s. Among the printed materials are the first issue of the emigre literary journal "Chisla," theatrical newspapers from Petrograd in 1914-16, and issues of French periodicals with Oks' memoirs about his legal career in Russia, including contacts with Lenin and Trotsky.