Air Service Boys Over the Enemy's Lines; Or, The German Spy's Secretby E. J. Craine Charles Amory Beach was a pseudonym used by the Stratemeyer Syndicate as author of a series of children\'s books. Pages of Air Service Boys Over the Enemy's Lines; Or, The German Spy's Secret : Page 1Page 2Page 3Page 4Page 5Page 6Page 7Page 8Page 9Page 10Page 11Page 12Page 13Page 14Page 15Page 16Page 17Page 18Page 19Page 20Page 21Page 22Page 23Page 24Page 25