"Luftwaffe." . . "Geschichte 1917-1919." . . . . . "History"@en . "Verzeichnis" . "History of the American Expeditionary Forces Air Service, 1917-1919"@en . . . "Gorrell's history of the American Expeditionary Forces Air Service, 1917-1919"@en . "Gorrell's history of the American Expeditionary Forces Air Service, 1917-1919" . . . . . "Mikroform" . . . "Quelle" . . "Gorrell's history of the American Expeditionary Forces Air Service : 1917-1919" . . . . "Gorrell's history of the American Expeditionary Forces Air Service : 1917 - 1919" . . . . . . . .