Columbia subject headings:
Learning and scholarship--Poland--History--20th century--Sources.
Poland--History--Occupation, 1939-1945--Sources.
Harvard subject headings:
Learning and scholarship--Poland--History--20th century--Sources.
Poland--History--Occupation, 1939-1945--Sources.
Princeton subject headings:
Learning and scholarship--Poland--History--20th century--Sources.
Poland--History--Occupation, 1939-1945--Sources.