The papers consist of manuscripts, photographs, and printed materials. Among the manuscripts are his typescript memoirs entitled "Vstrechi na zhiznennom puti" (53 pp.), which discuss his youth, student days in the history faculty of Moscow University, his work in the Constitutional Democratic (Kadet) Party, and the 1917 Revolution; and manuscripts of articles, some concerning the emigre monarchist movement. There are four photographs of Efimovskiĭ. Printed materials include offprints of his articles.

The collection consists of a small amount of correspondence (1942-1948) which revolves almost exclusively around Ernest Rope's efforts to teach Russian affairs at U.S. universities; one folder of personal documents, including letters of appointment, citations of merit, identity cards, and other items; manuscripts of articles and of a book length volume entitled "The Russia I have known;" and a diary, together with a photo-album, detailing his work in northern Russia and Estonia on behalf of the YMCA. The diary abounds with references to political and military events in northern Russia during the years 1919-1921.

Correspondence, manuscripts, documents, photographs, subject files, printed materials, and memorabilia of historian George Vernadsky (Georgii Vladimirovich Vernadskii; 1887-1973). Most of the collection consists of his personal and professional papers, circa 1918-1973. Sizable groups of materials also concern members of his family, especially his wife Nina (1884-1971); his father, scientist Vladimir I. Vernadskii (1863-1945); his mother Nataliia E. Vernadskaia (1860-1943); and his sister Nina V. Toll' (1898-circa 1976).

The collection contains correspondence, manuscripts by Marchenko and others, documents, photographs, printed materials, notebooks, notes, and subject files. Correspondence consists of Marchenko's personal correspondence and the correspondence of the Kronstadt Group, an anti-communist emigre organization. Manuscripts consist mostly of articles by Marchenko on the economy of the Soviet Union, many of them published. Printed materials include mimeographed materials, pamphlets, clippings, maps, and copies of several anti-Communist periodicals. Marchenko's notes and notebooks cover topics on economics, the Soviet Union and the Russian language. Subject files include information on the Institute for the Study of the U.S.S.R. (Munich) and the Kronstadt Group.