一本新出版的书中的文件指出一位在美国已故外交官，也是一位学者在西藏，提供了确凿的证据表明，早在第二十世纪，认为西藏是中国不可分割的一部分。

A newly published book on the documents of a late United States diplomat, who was also a scholar on Tibet, has provided conclusive evidence that the envoy in the early 20th century considered Tibet to be an inseparable part of China.

这份有关西藏的文件来自William W. Rockhill 的论文，由程龙编写的，原北京语言大学的副教授，是由中国五洲传播出版社最近出版的。

Selected Documents Relating to Tibet from William W. Rockhill Papers, compiled by Cheng Long, a former associate professor at Beijing Language and Culture University, was published recently by China Intercontinental Press.

William Rockhill（1854-1914），一个美国的外交官，在西藏的探险家、学者，对中国的对外开放政策和对藏学研究的几本书的美国作者。

William Rockhill (1854-1914), a US diplomat, explorer and scholar on Tibet, was the author of the United States' Open Door Policy for China and the author of several books on Tibetan studies.

“Rockhill多次对美国公众指出，西藏是中国不可分割的一部分，他向西奥多·罗斯福总统表明了他的态度，”程说

"Rockhill several times pointed out to the US public that Tibet is an inseparable part of China, and he introduced his position to president Theodore Roosevelt," Cheng said.

程说，他开始关注Rockhill是他2008年在南卡罗来纳州大学教学的时候，在美国的学生一直在问有关西藏的问题。

Cheng said he began to pay attention to Rockhill while he was teaching at the University of South Carolina in 2008, after US students kept asking questions about Tibet.

“所以我想出了一个想法 - 通过使用西方的历史文献来讨论西藏的历史和文化，这是更有说服力的，他们说：”他说。

"So I came up with an idea - to tell the history and culture of Tibet by using Western historical documents, which are more convincing to them," he said.

2008年初，程在哈佛和耶鲁大学寻找这样的文件，国会图书馆和美国国家档案馆，他从Rockhill描述西藏重收集了丰富的材料，。

From 2008 to early this year, Cheng searched for documents at such places as Harvard and Yale universities, the Library of Congress and the US National Archives, and he collected abundant materials from Rockhill related to Tibet.

根据美国国务院网站，Rockhill，出生在费城，在1894年四月被任命为国家第三助理秘书长。他在1905年被任命为美国中国大使直到1909。

According to the US State Department website, Rockhill, who was born in Philadelphia, was appointed as the third assistant secretary of state in April 1894. He was appointed US ambassador to China in 1905 and held the position until 1909.

Rockhill也是著名的西藏学者，曾参观过西藏两次。1908年，他几次会见了第十三达赖喇嘛，与他通过信件保持联系。

Rockhill was also a famous scholar of Tibet and visited the region twice. In 1908, he met several times with the 13th Dalai Lama, with whom he kept in touch through letters.