http://www.gutenberg.org/ebooks/subject/13797.opds 2025-04-05T17:34:32Z Books about Geometry, Projective (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://www.gutenberg.org webmaster@gutenberg.org https://www.gutenberg.org/gutenberg/favicon.ico 25 1 2025-04-05T17:34:32Z https://sendtokindle.compellingsciencefiction.com/ebooks/17001.opds An Elementary Course in Synthetic Projective Geometry Derrick Norman Lehmer