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Title: Join the Air Service--Learn-Earn / W.Z. ; Forbes, Boston. Date Created/Published:  Medium: 1 print (poster) : lithograph, color ; 76 x 51 cm. Summary: Poster showing the Air Service insignia, various aircraft including airplanes and dirigibles, and a crew tending to a plane in the foreground. Caption: "Give 'er the gun." Subjects: United States.--Army.--Air Service--1910-1920. World War, 1914-1918--Recruiting & enlistment--United States. Airplanes--1910-1920.