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One of the drawings in Guan Tianpei's "A Tentative Collection on Preparing for Coastal Defense"
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One of the drawings in Guan Tianpei's "A Tentative Collection on Preparing for Coastal Defense"
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Humen Coastal Defense Cannon's back showing the 28400 lb weight
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Guan Tianpei's "A Tentative Collection on Preparing for Coastal Defense"
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Label on Guan Tianpei's "A Tentative Collection on Preparing for Coastal Defense"
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Guan Tianpei's "A Tentative Collection on Preparing for Coastal Defense"
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Prof. Ching-chih Chen and Dongguan Public Library staff at the Humen Coastal Defense Cannon
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