京奉铁路之历史地理研究(1881-1912年)

黄清琦, 陈喜波

A historical geography research of Peking-Mukden Railway under the vision of modernization (1881-1912)

Chingchi HUANG, Xibo CHEN

图9 唐山—胥各庄间坡度分析

Fig. 9 Slope analysis of the area between Tangshan and Xugezhuang