Dennis doesn't like to brag much, but his book, The Secrets of Dellschau, is outstanding! I can't recommend it enough to those interested in airships, code breaking, secret societies, or outside artists. Yes, all those topics are part of The Secrets of Dellschau
https://www.amazon.com/SECRETS-DELLSCHAU-Sonora-Airships-1800s/dp/1933665351/ref=sr_1_1?ie=UTF8&qid=1493295070&sr=8-1&keywords=Secrets+of+Dellschau+by+Dennis+Crenshaw
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