From 1916 to 1917, Roy Chapman Andrews and Yvette Borup Andrews led the Asiatic Zoological Expedition of the American Museum of Natural History through much of western and southern Yunnan, as well as other provinces of China. The book, Camps and Trails in China, records their experiences. Other notable explorers include Heinrich Handel-Mazzetti; George Forrest; Joseph Francis Charles Rock, who from 1922 to 1949 spent most of his time studying the flora, peoples and languages of southwest China, mainly in Yunnan; and Peter Goullart, a White Russian who studied Naxi culture and lived in Lijiang from 1940 to 1949.