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A PRELIMINARY STUDY ON THE PALEOENVIRONMENT OF THE MIDDLE HOLOCENE IN THE HULU RIVER AREA IN GANSU PROVINCE AND ITS EFFECTS ON HUMAN ACTIVITY
Mo Duowen, Li Fei, Li Shuicheng, Kong Zhaochen
Acta Geographica Sinica . 1996, (1): 59 -69 .  DOI: 10.11821/xb199601007