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English: The hu dun pao in the Huolongjing
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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

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current05:13, 21 July 2016Thumbnail for version as of 05:13, 21 July 2016426 × 583 (174 KB)Underbar dkUser created page with UploadWizard

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