Note: "《墓碑》的作者杨继绳从北京给我写来一封电子邮件,说很多人打电话告诉他,中国到处都有《墓碑》的盗版书卖,甚至连新疆的克拉马依、石河子,甘肃的白银这样的小地方都有。"
(a) Karamay https://en.wikipedia.org/wiki/Karamay
(The name of the city comes from the Uyghur language, and means "black oil", referring to the oil fields near the city)
(b) Baiyin https://en.wikipedia.org/wiki/Baiyin