Found in 2 comments on Hacker News
I recently read "For All the Tea in China" which talks about these and Robert Fortune a bit, it was a fun book.
kerneltime · 2018-01-12 · Original thread
If you want to read more about history of tea consumption and the role of China, India and England, I recommend reading "For all the team in china: How England Stole the World's Favorite Drink and Changed History" It helped me understand why green tea is dominant in China vs. black tea in most other places..

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