Geology 14,251
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Appropriations and expenditures 9,292
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Rules and practice 6,717
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Management 6,521
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United States Foreign relations 5,279
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Mines and mineral resources 4,793
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Groundwater 4,670
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Geology, Stratigraphic 4,349
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Water quality 4,316
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History 4,306
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Artificial intelligence 4,265
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Officials and employees 4,217
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Economics 4,098
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Health 3,469
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Business 3,198
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Water-supply 3,117
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United States Politics and government 2,966
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Criticism and interpretation 2,903
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United States History 2,793
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Auditing 2,724
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National security 2,724
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Computer security 2,707
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Mathematics 2,596
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Evaluation 2,559
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Operas 2,268
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Entrepreneurship 2,082
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Selection and appointment 2,034
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Computer science 2,031
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United States 2,015
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Aquifers 1,814
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Emergency management 1,812
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Computer networks 1,803
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United States Foreign economic relations 1,751
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Climatic changes 1,736
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Stream measurements 1,698
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Education 1,691
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Water Pollution 1,686
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Hydrogeology 1,673
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Forest management 1,668
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Sustainable development 1,642
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Data mining 1,635
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World history 1,632
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Hydrology 1,624
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Paleontology 1,594
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Information technology 1,558
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Leadership 1,499
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Families 1,433
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Software engineering 1,416
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United States Economic conditions 1,399
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Machine learning 1,398
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Environmental policy 1,397
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Budget 1,384
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Water resources development 1,366
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Computer networks Security measures 1,364
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Engineering 1,353
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Indians of North America 1,348
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Sociology 1,332
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Groundwater Pollution 1,319
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Terrorism Prevention 1,300
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Groundwater Quality 1,257
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Water quality management 1,254
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Human rights 1,244
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Land titles Registration and transfer 1,237
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Psychology 1,225
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Human-computer interaction 1,212
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Personnel management 1,211
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National parks and reserves 1,209
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Public lands 1,205
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Groundwater flow 1,196
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Communication 1,194
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Renewable energy sources 1,192
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Energy policy 1,188
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Medical care 1,186
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Procurement 1,183
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Uranium ores 1,181
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Floods 1,169
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Geology, Structural 1,146
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Economic development 1,131
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Frontier and pioneer life 1,129
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Land use, Rural 1,122
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Air Pollution 1,110
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Criminal justice, Administration of 1,099
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World War, 1939-1945 1,093
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Conservation of natural resources 1,083
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Public health 1,081
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Computational intelligence 1,074
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World politics 1,065
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Database management 1,056
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Streamflow 1,047
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Outdoor recreation 1,044
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Planning 1,044
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Democracy 1,037
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Physics 1,016
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Economic assistance, American 1,012
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Economic sanctions, American 992
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Interpersonal relations 991
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Mathematical analysis 991
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Computer vision 985
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Language arts 983
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Educational technology 981
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