The beautiful Kodachrome pic above was taken by Carl Mydans in the late 1930s while touring the "Yellow River Front" against the Japanese in Kansu. The drab one below by me taken in 2012 en route from Xining to Ragya, using a Nikon 35Ti and Kodak Ektachrome.
And again by Carl Mydans:
And 60 years later, a bus breakdown between Dali and Lijiang on our 1998 Muli trip:
Dr Joseph Rock was an Austrian-born American botanist, anthropologist and explorer. He lived in South West China from the 1920s to 1949. During that time he went on many expeditions to remote parts of the Tibetan borderlands, collecting plants, taking photographs and collating maps. He described his trips in several articles in the National Geographic journal. After reading his articles, I was inspired to revisit places he described in Sichuan and Yunnan such as Muli, Yading, Deqin and Gongga Shan. This blog describes my travels and compares Rock's pictures with ones I have taken in the same places.