Ball, Samuel.
An account of the cultivation and manufacture of tea in China : derived from personal observation during an official residence in that country from 1804 to 1826 : and illustrated by the best authorities, Chinese as well as European : with remarks on the experiments now making for the introduction of the culture of the tea tree in other parts of the world. (London : Longman, Brown, Green, and Longmans, 1848).
https://archive.org/details/accountofcultiva00ballrich.
(BalS2)