Columbia subject headings:
Communists--Italy--Biography.
Partito comunista d'Italia--Biography.
Tresso, Pietro, 1893-1943.
World War, 1939-1945--Underground movements--France.
Harvard subject headings:
Communists--France--Biography
Tresso, Pietro 1893-1943?
World War, 1939-1945--Concentration camps--France.
World War, 1939-1945--Underground movements--France.
Princeton subject headings:
Communists--Italy--Biography.
Partito comunista d'Italia--Biography.
Tresso, Pietro, 1893-1943.
World War, 1939-1945--Underground movements--France.