Columbia subject headings:
Wielkopolska (Poland)--History--20th century.
World War, 1939-1945--Underground movements--Poland--Wielkopolska.
Harvard subject headings:
Wielkopolska (Poland)--History.
World War, 1939-1945--Underground movements--Poland--Wielkopolska.
Princeton subject headings:
Wielkopolska (Poland)--History.
World War, 1939-1945--Underground movements--Poland--Wielkopolska.