Columbia subject headings:
Gwardia Ludowa (Poland)--Sources.
Poland. Armia Ludowa--Sources.
World War, 1939-1945--Underground movements--Poland--Sources.
Harvard subject headings:
Gwardia Ludowa (Poland)--History--Sources.
Gwardia Ludowa (Poland)--Sources.
Poland. Armia Ludowa--History--Sources.
Poland. Armia Ludowa--Sources.
Polska Partia Robotnicza--History--Sources.
World War, 1939-1945--Underground movements--Poland--Sources.
Princeton subject headings:
World War, 1939-1945--Underground movements--Poland--Sources.