http://book.klll.cc/ebooks/subject/20500.opds 2025-08-06T10:01:00Z Books about Gyroscopes (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 2025-08-06T10:01:00Z https://book.klll.cc/ebooks/34268.opds Spinning Tops John Perry