http://book.klll.cc/ebooks/subject/10053.opds 2025-08-15T21:51:29Z Books about Arithmetic (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 2025-08-15T21:51:29Z https://book.klll.cc/ebooks/29914.opds Short Cuts in Figures A. Frederick Collins