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