National Geographic : 1928 Nov
AFTER PITCHING CAMP ON THE SOUTHERN SHORE OF THE KOKO NOR, THE AUTHOR'S PARTY TOOK ACHILLY SWIM The elevation of this lake is nearly two miles. Here the plunge in water having a temperature of 58° F.was invigorating. Doctor Rock made an excursion to this part of the Kansu country in the summer after his arrivalatChoni. THE YAK IS THE KANSU NATIVE'S BEST FRIEND Serving a double purpose as beast of burden and dairy cow, this hardy animal plays an important partinthe life of the Tibetan nomad. This caravan is traversing the Koko Nor grasslands 11,200 feet above sea level. Without the help of these sturdy beasts itisalmost impossible to ross the high nasses (see text. Dage 606).