Barth, C.G. History of the Twentieth Aero Squadron, First Day Bombardment Group, First Pursuit Wing, Air Service, First Army, American Expeditionary Force. Winona MN, Winona Labor News, n.d. circa 1920. 100pp, illus, rosters. Zerox copy from the New York Public Library, bound in red buckram. Very good reprint, some photos faded. Original copies of this book are very rare and will list at $300 and up. This is a good copy for your reference library.