The papers consist of correspondence, manuscripts, documents, subject files, newspaper clippings, printed materials, photographs, and drawings. Most of the correspondence concerns Bilyi's activities as Ataman, and the journal "Kazak"; other correspondence is personal or relates to the activities of anti-Communist groups (such as the Anti-Bolshevik Bloc of Nations - ABN). The manuscripts include articles, reminiscences, drafts of appeals and proclamations, and speeches mostly concerning the Cossack movement, Cossack history, and the anti-Communist movement. The documents mostly concern KNOD and related organizations for the period ca.1955-1970; a few relate to the Cossacks in 1919-1945. The subject files contain newspaper clippings, printed materials, notes, and correspondence relating to KNOD, ABN, "Kazak", Ukrainian-Cossack relations, and the Vlasov Movement. The newspaper clippings are mostly from Russian and Ukrainian emigre publications. Printed materials include a set of "Kazak" and ephemera of KNOD, ABN, and similar organizations. There are a few photographs showing Bilyi in Cossack dress and also various Cossack emigre organization activities. The paintings and drawings include portraits of Bilyi and his wife, Tatiana Iurievna Bilyi, in national dress (his Cossack, hers Czech), other Cossack leaders, Cossack heraldry, and a map of "Cossackia."

The collection consists of manuscripts by Sekara and printed materials. The manuscripts primarily deal with Sekara's military career during the Civil War. There is a copy of "Sumskie gusary 1651-1951" (Buenos Aires, 1954) to which various clippings and notes have been appended. In addition, there are a few dozen issues of the journals "The Sentinel" and "Voennai︠a︡ byl ́(The Military Past) dating from the 1950s to 1974.