Columbia subject headings:
Harvard subject headings:
World War, 1914-1918--Participation, Cossack--Congresses.
World War, 1939-1945--Participation, Cossack--Congresses.
Princeton subject headings:
World War, 1914-1918--Participation, Cossack--Congresses.
World War, 1939-1945--Participation, Cossack.--Congresses.