The collection contains correspondence, documents, manuscripts, a diary, memoirs, subject files, photographs and printed materials, mostly pertaining to Bishop Sergii of Prague and the Russian Orthodox Church in emigration. Included is a manuscript (49 p.) entitled "Russkim russkii o russkikh delakh." The subject files on Bishop Sergii contain correspondence, manuscripts, memoirs, photographs and miscellaneous items by and about the bishop.

Correspondence, manuscripts, photographs, and printed materials of Toporkov. Much of the collection consists of materials Toporkov collected and used for a three-volume history of the Fifth Hussar Regiment (Pi︠a︡tĭ gusarskiĭ aleksandri ĭskiĭ polk), of which he had been a member. There are also materials concerning members of the regiment who emigrated after the 1917 Revolution. The correspondence (1919-1952) includes letters to and from members of several emigre military organizations. the manuscripts include essays and memoirs about the regiment during World War I and the Civil War (including several by Toporkov himself) as well as Toporkov's three-volume history of his regiment from the eighteenth century through 1929, the regiment museum, individual members of the regiment, regiment celebrations (1926-1935), the Court of Honor, and regiment financial affairs (1925-1948). Among the printed materials are clippings and materials relating to a number of emigre organizations.