Columbia subject headings:
World War, 1914-1918--Aerial operations.
World War, 1914-1918--Greece--Personal narratives, German.
World War, 1914-1918--Personal narratives, German.
Harvard subject headings:
World War, 1914-1918--Aerial operations
World War, 1914-1918--Greece--Personal narratives, German.
World War, 1914-1918--Personal narratives, German
Princeton subject headings: