Columbia subject headings:
Harvard subject headings:
Aviation psychology--History.
Military psychiatry--History.
War neuroses--History.
World War, 1914-1918--Aerial operations
World War, 1914-1918--Medical care
Princeton subject headings:
Aviation psychology--History.
Military psychiatry--History.
War neuroses--History.
World War, 1914-1918--Aerial operations.
World War, 1914-1918--Medical care.