http://book.klll.cc/ebooks/author/31202.opds 2025-11-15T16:42:02Z Books by Song, Yingxing Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-15T16:42:02Z https://en.wikipedia.org/wiki/Song_Yingxing See also: en.wikipedia 2025-11-15T16:42:02Z https://book.klll.cc/ebooks/25273.opds 天工開物 (Chinese) Yingxing Song