U.S. Department of State, CIA World FactBook page for China, Consular Information Sheet from the State Dept.
china.org.cn Virtual Tourist, Info Please, About.com, About China at 4panda.com

The American Embassy in China. Tibet falls in the region covered by the The US Consulate in Chengdu Tel: (28) 558-3992, 558-9642 Email: consularchengdu@state.gov