Columbia subject headings:
Prisoners of war--Poland.
Prisoners of war--Soviet Union.
World War, 1939-1945--Concentration camps--Soviet Union.
World War, 1939-1945--Deportations from Poland.
World War, 1939-1945--Prisoners and prisons, Soviet.
Harvard subject headings:
Internment camps--Soviet Union
Polish people--Soviet Union.
Prisoners of war--Poland
Prisoners of war--Soviet Union.
Princeton subject headings:
Forced labor--Soviet Union.
World War, 1939-1945--Concentration camps--Soviet Union.
World War, 1939-1945--Deportations from Poland.