A century after the expedition from 1975 to 2004, a freelance photographer, follow Clark expedition, re-examine their route, covering thousands of kilometers. Some of the points originally captured expedition recorded again landscapes and historic sites and people live their daily lives in this land. To commemorate the one hundredth anniversary of the publication of the review, the China Legal Publishing House has assembled an original photo by Clark expedition and the new image by Li Ju and his colleagues. The Loess Plateau of years to look back (in English) to the Chinese and foreign readers intuitive and vivid understanding of the history of China's northwest and dramatic changes in the past century - a more intuitive passage of time and culture continue.