Columbia subject headings:
Poland--History--Wars of 1918-1921--Prisoners and prisons, Polish.
Prisoners of war--Poland.
Prisoners of war--Soviet Union.
Tuchola (Concentration camp)
World War, 1914-1918--Prisoners and prisons, German.
Harvard subject headings:
Russo-Polish War, 1919-1920--Prisoners and prisons, Polish.
Tuchola (Concentration camp)
Princeton subject headings:
Russo-Polish War, 1919-1920--Prisoners and prisons, Polish.