Columbia subject headings:
Harvard subject headings:
Cossacks--History--20th century.
Krasnov, P. N. (Petr Nikolaevich), 1869-1947
Semenov, G. (Grigoriĭ), 1890-1946
Soviet Union--History--Revolution, 1917-1921--Campaigns.
Soviet Union--History--Revolution, 1917-1921--Participation, Cossack.
Princeton subject headings:
Cossacks--Russia (Federation)--History.