Columbia subject headings:
Harvard subject headings:
Italo-Ethiopian War, 1935-1936--Trench Warfare.
Italy. Esercito--History--20th century.
Italy. Regio Esercito--History--20th century.
World War, 1914-1918--Italy.
World War, 1914-1918--Trench warfare
World War, 1939-1945--Italy.
World War, 1939-1945--Trench warfare.
Princeton subject headings:
Italy. Esercito--History.
World War, 1914-1918--Italy.
World War, 1939-1945--Italy.