Bats in the Wall; or, The Mystery of Trinity Church-yard
Airplane Boys in the Black Woods
Air Mystery of Isle La Motte
Air Service Boys over the Atlantic; Or, The Longest Flight on Record
Air Service Boys Over The Rhine; Or, Fighting Above The Clouds
Air Service Boys Over the Enemy's Lines; Or, The German Spy's Secret
Air Service Boys Flying for Victory; Or, Bombing the Last German Stronghold
Air Service Boys in the Big Battle; Or, Silencing the Big Guns
