http://book.klll.cc/ebooks/author/7084.opds 2025-11-16T13:58:18Z 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 2025-11-16T13:58:18Z https://en.wikipedia.org/wiki/Derrick_Norman_Lehmer See also: en.wikipedia 2025-11-16T13:58:18Z https://book.klll.cc/ebooks/17001.opds An Elementary Course in Synthetic Projective Geometry Derrick Norman Lehmer