Yün-nan

The mining industry was severely crippled by the Pathay Rebellion ; but prior to that date, although iron ore is most abundant, copper was mined on a much larger scale in order to provide for the requirements of the Empire, which formerly were almost entirely dependent upon the Yün-nan mines for their needs, which may be put at about 6,000 tons annually.

1911, Edwin J. Dingle, Across China on Foot: Life in the Interior and the Reform Movement, New York: Henry Holt and Company, →OCLC, →OL, page 428^(https://commons.wikimedia.org/wiki/File:Across_China_on_foot;_life_in_the_interior_and_the_reform_movement_(IA_acrosschinaonfoo00ding).pdf)

Not all of Yün-nan is beautiful. Much of it is just roughly churned rock, much is flat and drab. But it has room for many pictures as well; Yün-nan is vast, China's third province in size, its area almost one fourth more than Great Britain's.

1927, Louise Jordan Miln, In a Yün-nan Courtyard, Frederick A. Stokes Company, page 914

In 1922 Rock took up his residence in Li-chiang, the heart of the Na-khi country. His interest in these aboriginal people and their unique culture led him to make, a decade later, his life work the study of the Na-khi tribe of northwest Yün-nan Province. Using Li-chiang as a base, Rock explored and collected plants on the nearby Snow Range to the 17,000 foot level, in the Kingdom of Mu-li, and along the Burma-China border. By 1923 he was far into Yün-nan Province in southwest China, and the National Geographic Society took over the sponsorship of his explorations for more than a year.

1963, Alvin K. Chock, “J. F. ROCK, 1884-1962”, in Newsletter of the Hawaiian Botanical Society, volume 2, number 1, Honolulu: University of Hawaii, pages 4-5