These papers consist of correspondence, manuscripts, documents, and printed materials. Most of the correspondence concerns Florinsky's publications and editorial work. Among the correspondents are Boris Bakhmeteff, Michael Karpovich, Aleksandr Meyendorff, Bernard Pares, James T. Shotwell, and Dmitriĭ Svi︠a︡topolk-Mirskiĭ: there are one or two items each from John Dewey, Herbert Hoover, Edwin Seligman, and Harry S. Truman. Manuscripts by Florinsky include his "Russia: A Short History" and some minor articles and book reviews. Other manuscripts include a poem by Bernard Pares and a study by Sergeĭ Prokopovich of the Soviet five-year plan of 1946-50; there is also a photograph of Meyendorff. Documents concern Florinsky's career at Columbia and also include book contracts. Printed materials consist chiefly of reviews of his works and reviews he wrote of others' books.

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.