The collection includes correspondence, manuscripts, memoirs, diaries, notes, subject files, documents, photographs, and printed materials. Most of the material in the collection concerns Nikolaev's tenure as military attachʹe at the Russian embassy in Washington. Cataloged correspondents include Mikhail T. Florinsky and Geroid T. Robinson. There is a typescript by Vasiliĭ O. Kli︠u︡chevskiĭ, "Kratkoe posobie po russkoĭ istorii." Among the correspondence are cablegrams and official communications to the Russian embassy during World War I and the revolutionary period. Manuscripts, mostly by Nikolaev, concern contemporary and historical military topics. Diaries and memoirs deal with Nikolaev's travels to Europe during World War I and his activities as military attachʹe. Among orders granted to Nikolaev is the "Order of the Sacred Treasure," signed and sealed by the Japanese Emperor Meiji (1911). Printed materials include many articles by Nikolaev.

Correspondence, manuscripts, photographs, subject files and printed materials. The correspondence includes letters from Michael Florinsky, Mikhail Karpovich, Bernard Pares, Geroid Robinson and George Vernadsky as well as one each from Lidii︠a︡ Lopukhova, Lewis Mumford and George Orwell. There is abundant correspondence relating to the Cunard Whitestar Line, notably from Anthony Cunard. The manuscripts include drafts of several of Fedotoff-White's books as well as copious notes and book reviews. There are subject files relating to his curriculum vitae, financial affairs, and his university studies. Among the printed materials are books (including several of his own), clippings, pamphlets, and brochures.

The collection consists of correspondence, manuscripts, documents, photographs, subject files and printed material. The correspondence is primarily from the 1920s and includes letters from G. E. Lv́ov and S. P. Mel'gunov and one or two items each from M. A. Aldanov, I. A. Bunin, N. V. Chaikovskii, A. L. Tolstaiia, V. F. Zeeler and others. The manuscripts are primarily in the form of notes in Polner's hand and include Polner's diary from the years 1919-1925. The documents belong to Tikhon Polner's brother, Sergei, and deal with the latter's expulsion from the USSR in 1921. There is extensive material in the subject files on the writings of Lev Tolstoĭ, including typescript copies of several Tolstoi manuscripts and clippings of the reviews of Polner's book on Tolstoi. Also included is a photograph of A. I. Herzen from the 1850s.