"World War, 1914-1918 Aerial operations." . . . . "The German air force in the great war From the records and with the assistance of 29 officers and officials of the naval and military air services" . . . . . "The German airforce in the great war ; from the records and with the assistance of 29 officers and officials of the naval and military air-services" . "The German air force in the great war : compiled from the records and with the assistance of 29 officers and officials of the naval and military air services" . . . . . "Aeronautics, Military." . . "World War, 1914-1918 Germany." . . . .