Columbia subject headings:
Harvard subject headings:
Dansk samling--History.
Denmark--History--Christian X, 1912-1947.
Denmark--History--German occupation, 1940-1945.
Political parties--Denmark--History--20th century.
Sørensen, Arne, 1906-
World War, 1939-1945--Underground movements--Denmark.
Princeton subject headings:
Dansk samling--History.
Denmark--History--Christian X, 1912-1947.
Denmark--History--German occupation, 1940-1945.
Sørensen, Arne, 1906-
World War, 1939-1945--Underground movements--Denmark.