http://book.klll.cc/ebooks/subject/10052.opds 2025-08-16T09:45:15Z Books about Ready-reckoners (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 2025-08-16T09:45:15Z https://book.klll.cc/ebooks/29914.opds Short Cuts in Figures A. Frederick Collins