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| Keywords: Hudunpao-huolongjing.jpg en The hu dun pao in the Huolongjing 1350 en Huolongjing Immediate source Science and Civilisation in China Volume 5 Chemistry and Chemical Technology Part 7 Military Technology The Gunpowder Epic by Joseph Needham page 279 Jiao Yu other versions PD-old-70-1923 Huolongjing Artillery of China Crouching tiger cannon | ||||
