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Palaeogene fossil Populus leaves from Lanzhou Basin and their palaeoclimatic significance[J]. SUN Bainian1,2, YAN Defei1, XIE Sanping1, CONG Peiyun1, XIN Cunlin1 & YUN Fei1 1. Key Laboratory of Western China抯 Environmental Systems of the Ministry of Education, Lanzhou University, Lanzhou 730000, China;2. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sci-ences, Nanjing 210008, China.Chinese Science Bulletin. 2004(14)