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On Saturday, February 2, 2019 at 3:59:37 PM UTC-8,..@gmail.com wrote: 
> > http://press.princeton.edu/titles/10571.html
> According to this: 
> 
 > - The goods brought in by the Japanese [during the Ming dynasty]
consisted, among other things, of swords in great number and quantities of
copper ore and sulfur, the last used in gunpowder. 
> 
https://books.google.com/books?id=6AeGAAAAIAAJ&q=%22the+goods+brought+in+by+the+
Japanese%22&dq=%22the+goods+brought+in+by+the+Japanese%22&hl=en&sa=X&ved=0ahUKEw
igx9f5n57gAhVCMn0KHYfLDGoQ6AEIKjAA

(Youtube upload):

"Evolution of Early Gunpowder Weaponry - from Ancient China to Europe"
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