1) Early firearm 2) Ming dynasty literature
Found on
https://www.crosswordclues.com/clue/huolongjing
The Huolongjing ({zh|t=火龍經|s=火龙经|p=Huǒ Lóng Jīng|first=t}; Wade-Giles: Huo Lung Ching; rendered by its translator into English as Fire Drake Manual; in modern English, Fire Dragon Manual) is a 14th-century military treatise that was compiled and edited by Jiao Yu and Liu Ji of the early Ming Dynasty (1368–1644) in China. It outlin...
Found on
http://en.wikipedia.org/wiki/Huolongjing
No exact match found.
