Image: Thunderclap bomb
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Description: An illustration of a thunderclap bomb as depicted in the 11th century book Wujing Zongyao.
Title: Thunderclap bomb
Credit: Wujing Zongyao, from Science and Civilisation in China p. 164
Author: Zeng Gongliang, Ding Du, and Yang Weide
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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