Columbia subject headings:
Aeronautics, Military--United States--History.
United States. Army. Air Service--History.
United States. Army. American Expeditionary Forces. Air Service.
World War, 1914-1918--Aerial operations, American.
Harvard subject headings:
Aeronautics, Military--United States--History
United States. Army. American Expeditionary Forces. Air Service--History.
World War, 1914-1918--Aerial operations, American
Princeton subject headings:
Aeronautics, Military--United States--History.
United States. Army. Air Service--History.
World War, 1914-1918--Aerial operations, American.