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Forest and grassland coverage change in the Yellow River-Huangshui River Valley in northeast Qinghai-Tibet Plateau during the Qing Dynasty
Zhilei WU, Fenggui LIU, Yili ZHANG, Qiong CHEN, Qiang ZHOU, Dengxing YANG
PROGRESS IN GEOGRAPHY . 2016, (6): 768 -778 .  DOI: 10.18306/dlkxjz.2016.06.010