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Langley Memoir on Mechanical Flight, Parts I and II: Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911, written by S. P. (Samuel Pierpont) Langley, is now in the public domain and available here for free download. Cataloged in Category: Engineering & Technology and Category: History - Modern (1750+), this title joins thousands of works in our science collection.

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