Download or read book Air Service Boys Over the Enemy's Lines, Or, The German Spy's Secret written by Charles Amory Beach and published by . This book was released on 1919 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: The adventures of young American pilots during World War I in their air-duels with German pilots and their interception of German homing pigeons used to send messages from German spies in France back to Germany.