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 who explored the Tibetan borderlands of Sichuan and Yunnan ins the 1920s and 30s. This is a blog of my travels to revisit the amazing places he described in the National Geographic magazine.