Conquest of the Air Aviation Zeppelins Pictorial April 1914 Mentor Magazine(Old Magazines, Early 20th Century Magazines, Americana, Illustrated Magazines, Science, Aviation, Zeppelins). The Mentor: The Conquest of the Air, Department of Science. Published April 1st, 1914, New York by The Mentor Association, Inc. 12 pages plus six plates. Text in English. Illustrated plus six loose nicely printed photographic plates. Nice early 20th century American magazine with pleasing visual content. Binding clean, come edge chipping,