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author
l
langley-s-p-samuel-pierpont
book-langley-memoir-on-mechanical-flight-parts-i-and-iismithsonian-contributions-to-knowledge-volume-27-number-3-publication-1948-1911-2
read-langley-memoir-on-mechanical-flight-parts-i-and-iismithsonian-contributions-to-knowledge-volume-27-number-3-publication-1948-1911-2
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