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Langley, S. P. (Samuel Pierpont), 1834-1906
(2)
Langley Memoir on Mechanical Flight, Parts I and II : Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911 [electronic resource] / S. P. Langley
The New Astronomy [electronic resource] / S. P. Langley
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