Q: Best source for debunking 1904 "iced tea"?

[Joel S. Berson]

What is the best source for debunking the myth that iced tea was
invented at the 1904 St. Louis World's Fair?  And, possibly,
debunklng that it was popularized there, since there are a number of
quotations from the 1870s?

I'm looking (Googling), but so far all I've found is the debunking
that cites 1890 -- which also is not the current earliest.

Joel

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