Berlin, Julius Springer Publisher, 1913. 200pp, 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, article on air-to-ground radio, tables of airship characteristics, tests on airship envelopes, etc. German text. Fair-good, x-lib with only one rubber stamp on title page.