http://book.klll.cc/ebooks/subject/10113.opds 2025-09-03T15:44:03Z Books about Horology (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 2025-09-03T15:44:03Z https://book.klll.cc/ebooks/30001.opds On the Origin of Clockwork, Perpetual Motion Devices, and the Compass Derek J. de Solla Price