Papers include correspondence, manuscripts, documents, photographs, subject files, and printed materials. The extensive correspondence relates to Mogilat's personal and professional activities and includes letters from many of her students and colleagues. Correspondents include Gleb Struve, Alexandra Tolstoy and Boris Unbegaun. Of special interest are letters by her first husband Baron von Taube, written from the front during World War I, and correspondence with various Russian acqaintances about the Soviet Union in the 1920s and 1930s in which they describe life in a communal apartment, and plans to rescue friends who have been arrested. Subject files concern Columbia's Russkiĭ Kruzhok and the Avtonomoff method of teaching Russian to Americans. There are letters, photographs, concert programs and music of Russian emigre composer and pianist Ariadna Mikeshina. Manuscripts are by various persons; most are by John Paul Mihaly, who had been Mogilat's student. There is also a manuscript of translations by Clarence Manning, "Four Poems by Blok." Documents and photographs concern Mogilat and her family, both before and after emigration. Printed materials consist mostly of off-prints of articles by Clarence Manning and others, primarily on literary topics. There are also books, mimeographed materials, periodicals, and clippings.

The collection contains correspondence, manuscripts, clippings, books and periodicals. There are two letters from Aleksandr Glazunov and one each from Aleksandr Grechaninov and Nikolaĭ Metner. The manuscripts deal with both cultural affairs and the Russian Revolution. Among the cultural topics are essays on music, Isadora Duncan, Maksim Gorḱiĭ and literary affairs. There are articles about general aspects of the Revolution and about such individuals as Lenin, Stalin, Chicherin, Dzerzhinskiĭ and Kamenev. Many of the articles are memoiristic in nature, particularly those about life in Moscow and in the provinces during the Revolution, Dzerzhinskiĭ and Kamenev. There are clippings of articles written by Sabaneev and a number of books and periodicals either written by Sabaneev or containing articles by him.

The collection consists primarily of Voice of America transcripts, dating from 1950-1963. (There are also six notebooks containing notes taken during interviews). The subject files include materials of "Asotsiïatsiï Ukraïnsḱykh Universytetsḱykh Z︠h︡inok na Emihratsiï." The printed materials consist of clippings with articles by Drazhevsḱa (1947-1963), brochures, periodicals and books. The later 1-box addition contains materials from 1960s and 1970s.

The collection includes correspondence, photographs, manuscripts and printed materials. There are letters from Ekaterina Kuskova (Mrs. S.N. Prokopovich) and photographs of Mark Aldanov, Marie Curie, Aleksandra Kollontaĭ, Ekaterina Kuskova, Pavel Mili︠u︡kov, Mikhail Osorgin, Sergeĭ Prokopovich and Nadezhda Teffi among others. The manuscripts include drafts and typescripts for several dozen articles and chapters as well as untitled manuscripts and notes. The printed materials contain clippings and offprints of articles by Prokopovich, periodicals he edited, and copies of his major books.

Most of the collection consists of manuscripts by Lebedev and others on Russian and East European literary and political topics from about 1914 to the 1930s. There are three microfilm reels of materials on Gavrilo Princip and the asassination of Archduke Ferdinand in Sarajevo, 1914. Correspondents include Hamilton Fish Armstrong and George F. Kennan. There are several drafts of articles by Mark Slonim and materials on the Socialist Revolutionaries in the emigration from about 1930. Lebedev's personal documents cover from his army service (the Russo-Japanese War), through the 1917 Revolution and Civil War, and his later life in Europe and the United States. There are photographs from interwar Albania and Bulgaria, including ones of Aleksandŭr Stamboliski. Printed materials include a copy of Lebedev's book "Novym putem" and issues of "Voli︠a︡ Rossii.".