Geology 14,194
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Appropriations and expenditures 9,226
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Rules and practice 6,610
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Management 6,485
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United States Foreign relations 5,243
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Mines and mineral resources 4,767
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Groundwater 4,664
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Geology, Stratigraphic 4,344
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Water quality 4,312
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History 4,291
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Artificial intelligence 4,243
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Officials and employees 4,187
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Economics 4,076
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Health 3,458
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Business 3,197
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Water-supply 3,103
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United States Politics and government 2,962
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Criticism and interpretation 2,889
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United States History 2,798
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Computer security 2,695
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Auditing 2,683
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National security 2,681
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Evaluation 2,533
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Mathematics 2,349
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Operas 2,261
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Entrepreneurship 2,078
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Selection and appointment 2,024
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United States 2,012
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Computer science 1,955
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Aquifers 1,813
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Emergency management 1,808
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Computer networks 1,787
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United States Foreign economic relations 1,738
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Climatic changes 1,722
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Stream measurements 1,682
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Water Pollution 1,678
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Education 1,677
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Hydrogeology 1,671
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Forest management 1,663
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Sustainable development 1,639
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Data mining 1,632
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Hydrology 1,625
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World history 1,624
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Paleontology 1,596
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Information technology 1,547
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Leadership 1,491
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Families 1,424
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Software engineering 1,411
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United States Economic conditions 1,395
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Environmental policy 1,394
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Machine learning 1,390
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Budget 1,374
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Water resources development 1,364
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Computer networks Security measures 1,360
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Engineering 1,348
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Indians of North America 1,341
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Groundwater Pollution 1,317
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Sociology 1,314
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Terrorism Prevention 1,297
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Groundwater Quality 1,254
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Water quality management 1,248
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Human rights 1,234
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Land titles Registration and transfer 1,231
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Psychology 1,220
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Human-computer interaction 1,210
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National parks and reserves 1,206
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Personnel management 1,204
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Public lands 1,204
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Groundwater flow 1,199
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Communication 1,190
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Renewable energy sources 1,189
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Energy policy 1,184
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Medical care 1,182
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Uranium ores 1,180
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Procurement 1,177
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Floods 1,169
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Geology, Structural 1,143
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World War, 1939-1945 1,133
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Frontier and pioneer life 1,126
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Economic development 1,121
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Land use, Rural 1,109
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Air Pollution 1,104
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World politics 1,090
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Criminal justice, Administration of 1,083
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Conservation of natural resources 1,078
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Public health 1,071
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Computational intelligence 1,064
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Database management 1,049
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Streamflow 1,047
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Planning 1,036
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Outdoor recreation 1,035
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Democracy 1,029
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Economic assistance, American 1,004
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Score 1,001
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Mathematical analysis 991
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Economic sanctions, American 984
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Language arts 983
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Computer vision 981
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Educational technology 980
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Interpersonal relations 979
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