Crosby, Lieut. P.L. THAT ROOKIE FROM THE 13TH SQUAD. New York: Harper and Brothers, (1918). Illustrated with humorous World War I cartoons. 9 x 8 inches. Cloth backed pictorial boards; light rubbing.

First edition, with the famous "War Service Library" label inside cover. 

Percy Lee Crosby was an American author, illustrator and cartoonist best known for his comic strip Skippy. Adapted into movies, a novel and a radio show, Crosby's creation was commemorated on a 1997 U.S. Postal Service stamp. - Wikipedia.