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STUDY ON ASSESSMENT OF THE ECOLOGICAL SECURITY IN THE CONTINENTAL WATERSHEDS IN NORTHWEST CHIAN—A Case Study at the Middle Reaches of Heihe River Watershed, Zhangye Prefecture
Chen Dong-jing, Xu Zhong-min
Arid Land Geography . 2002, (3): 219 -224 .  DOI: 10.13826/j.cnki.cn65-1103/x.2002.03.005