Columbia subject headings:
Harvard subject headings:
United States. Air Force--History.
World War, 1939-1945--Aerial operations, American.
World War, 1939-1945--Campaigns--Western Front.
Princeton subject headings:
United States. Air Force--History.
World War, 1939-1945--Aerial operations, American.
World War, 1939-1945--Campaigns--Western Front.