http://book.klll.cc/ebooks/subject/19214.opds 2025-08-08T12:38:16Z Books about Parallels (Geometry) (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 2025-08-08T12:38:16Z https://book.klll.cc/ebooks/31911.opds Synthetische Theorie der Cliffordschen Parallelen und der Linearen Linienörter des Elliptischen Raumes (German) Wolfgang Vogt