http://book.klll.cc/ebooks/subject/810.opds 2025-09-17T12:44:30Z Books about Mathematical instruments (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 2025-09-17T12:44:30Z https://book.klll.cc/ebooks/27936.opds Histoire des nombres et de la numération mécanique (French) Jacomy-Régnier