Columbia subject headings:
Harvard subject headings:
Great Britain. Royal Air Force. 74 Squadron.
World War, 1914-1918--Aerial operations
World War, 1939-1945--Aerial operations, British.
Princeton subject headings:
Great Britain. Royal Air Force. 74 Squadron.
World War, 1914-1918--Aerial operations.
World War, 1939-1945--Aerial operations, British.