Berlin, Julius Springer Publisher, 1913. 226pp, photo and drawing illus, 8x11", hardcover. Progress in aeroplane and airship design, development and production. Technical specs and charts. Article on activities in various countries, balloon flight altitude records/results, tables of airship flights, propeller design, airfoil wind tunnel results, airshow records, etc. German text. Fair-good, x-lib with only one rubber stamp on title page.