S. P. (Samuel Pierpont) Langley
Langley Memoir on Mechanical Flight, Parts I and II Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911
S. P. (Samuel Pierpont) Langley · 2015
ספרייה ציבורית, Project Gutenberg. בלי הרשמה.
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