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United Nations Convention to Combat Desertification (UNCCD) 15 United States Geological Survey 14 Bureau of Land Management 8
University of Arizona 6 Colorado State University 4 Prescott College 3
E18 2 New Mexico State University 2 Technical Information Center Oak Ridge Tennessee 2
University of California, Davis 2 Arizona State University 1 Forest Service, Washington DC 1
General Accounting Office 1 George Mason University 1 Non Paid ADAS 1
University of California, Berkeley 1 University of Nevada, Reno 1 University of Washington 1
兰州大学 1 西北师范大学 1