http://book.klll.cc/ebooks/subject/4265.opds?sort_order=release_date 2026-01-13T11:50:26Z Books about Mathematics, Chinese -- Early works to 1800 Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2026-01-13T11:50:26Z https://book.klll.cc/ebooks/24038.opds 孫子算經 (Chinese) approximately 5th century Sunzi 2026-01-13T11:50:26Z https://book.klll.cc/ebooks/12408.opds 周髀算經 (Chinese) Unknown