http://book.klll.cc/ebooks/author/44566.opds?sort_order=downloads 2025-08-20T09:03:40Z Books by Langley, S. P. (Samuel Pierpont) (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-08-20T09:03:40Z https://book.klll.cc/ebooks/author/44566.opds?sort_order=title Sort Alphabetically by Title 2025-08-20T09:03:40Z https://book.klll.cc/ebooks/author/44566.opds?sort_order=release_date Sort by Release Date 2025-08-20T09:03:40Z https://en.wikipedia.org/wiki/Samuel_Langley See also: en.wikipedia 2025-08-20T09:03:40Z https://book.klll.cc/ebooks/47981.opds Langley Memoir on Mechanical Flight, Parts I and II S. P. Langley and Charles M. Manly 2025-08-20T09:03:40Z https://book.klll.cc/ebooks/64577.opds The New Astronomy S. P. Langley