Here in one volume are the separate histories of all U.S. Navy airships, including the great rigid dirigibles and their hook-on planes. Book features the Navy's first hydrogen-filled non-rigids, each airship purchased abroad, the histories and specifications of the huge rigid dirigibles in the ZR series, the interwar years' blimps, the use of airships in WWII, and the post-war airships. Book features rare and breathtaking photos.