Image: Hudunpao-huolongjing
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Description: The hu dun pao in the Huolongjing
Title: Hudunpao-huolongjing
Credit: 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
Author: Jiao Yu
Usage Terms: Public domain
License: Public domain
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