Three wonderful collections from the Library of Congress, showing obsolete technologies.
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"Airships past and present - together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon" by A. Hildebrandt, captain and instructor in the Prussian Balloon Corps (1908). Pictures, table of contents and list of illustrations below. Related: Camping in the clouds - the zeppelin that never lands / Green slow air cargo / Kite aerial photography.
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