自然资源学报
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JOURNAL OF NATURAL RESOURCES  2012, Vol. 27 Issue (12): 2135-2144    DOI: 10.11849/zrzyxb.2012.12.014
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Analysis of Drought-flood Spatial-temporal Characteristics Based on Standard Precipitation Index in East Region of Gansu in Recent 40 Years
WANG Yuan-yuan, ZHANG Bo
College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China

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