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[en] [Gutenberg 64577] • The New Astronomy General Books
Langley, S.P.
[en] [Gutenberg 47981] • Langley Memoir on Mechanical Flight, Parts I and II / Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911 Forgotten Books
Langley, S.P. & Manly, Charles M.
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