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Books about Flying-machines (sorted by popularity)
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Flying Machines: Construction and Operation
William J. Jackman, Thomas Herbert Russell, and Octave Chanute
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https://sendtokindle.compellingsciencefiction.com/ebooks/51481.opds
Flying Machines Today
William D. Ennis
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https://sendtokindle.compellingsciencefiction.com/ebooks/4065.opds
Side-Lights on Astronomy and Kindred Fields of Popular Science
Simon Newcomb