Here is the offical website of Xining city,the capital of Qinhai province. you can have a look at its english version. http://www.xining.gov.cn/ Han-Chinese started to live in Xining in about 150 BC,when Rome was still struggling to defeat Carthage and Tibetan didn't appeared at all. But Dalai and you also insist that Xinning is a part of "Greater Tibet"...
