http://book.klll.cc/ebooks/author/7084.opds?sort_order=title 2025-11-17T03:49:41Z Books by Lehmer, Derrick Norman Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-17T03:49:41Z https://en.wikipedia.org/wiki/Derrick_Norman_Lehmer See also: en.wikipedia 2025-11-17T03:49:41Z https://book.klll.cc/ebooks/17001.opds Elementary Course in Synthetic Projective Geometry Derrick Norman Lehmer