Little is available in the way of bibliography on lighter-than-aircraft, their history and characteristics. Among the best works dealing with this subject are Captain C. E. Rosendahl’s, “What About the Airship?” (Scribner’s), and “Up Ship” (Dodd Mead); Captain Ernst Lehmann’s “Zeppelin” (Longman’s) and Captain J. A. Sinclair’s “Airships in Peace and War” (Rich & Cowan, London).

Copies of “The Story of the Airship (Non-Rigid),” may be procured through The Goodyear Tire & Rubber Co. at Akron, Ohio; or at Los Angeles, or branch offices.