Columbia subject headings:
Harvard subject headings:
Europe--History--20th century.
Socialism--Europe--20th century.
Socialism--Europe--History--20th century
World War, 1939-1945--Underground movements.
Princeton subject headings:
Italy--History--1922-1945--Sources.
Socialism--Italy--History--20th century--Sources.
Socialists--Attitudes--History--20th century--Sources.