Geology 14,187
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Appropriations and expenditures 9,209
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Rules and practice 6,574
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Management 6,452
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United States Foreign relations 5,225
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Mines and mineral resources 4,766
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Groundwater 4,664
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Geology, Stratigraphic 4,343
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Water quality 4,310
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History 4,251
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Artificial intelligence 4,178
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Officials and employees 4,167
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Economics 4,056
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Health 3,377
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Business 3,195
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Water-supply 3,101
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United States Politics and government 2,954
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Criticism and interpretation 2,876
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United States History 2,791
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Computer security 2,683
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Auditing 2,680
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National security 2,669
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Evaluation 2,528
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Operas 2,261
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Mathematics 2,114
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Entrepreneurship 2,074
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Selection and appointment 2,019
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Computer science 2,018
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United States 2,014
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Aquifers 1,813
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Emergency management 1,798
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Computer networks 1,757
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United States Foreign economic relations 1,737
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Climatic changes 1,709
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Education 1,686
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Stream measurements 1,682
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Water Pollution 1,674
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Hydrogeology 1,671
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Forest management 1,662
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Sustainable development 1,637
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Hydrology 1,624
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World history 1,620
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Data mining 1,618
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Paleontology 1,591
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Information technology 1,545
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Leadership 1,476
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Families 1,416
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United States Economic conditions 1,392
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Environmental policy 1,391
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Software engineering 1,385
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Machine learning 1,380
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Budget 1,364
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Water resources development 1,362
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Computer networks Security measures 1,360
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Indians of North America 1,335
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Groundwater Pollution 1,317
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Terrorism Prevention 1,294
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Sociology 1,280
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Engineering 1,262
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Groundwater Quality 1,253
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Water quality management 1,247
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Land titles Registration and transfer 1,229
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Human rights 1,222
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Human-computer interaction 1,209
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National parks and reserves 1,204
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Psychology 1,201
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Groundwater flow 1,199
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Personnel management 1,198
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Public lands 1,198
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Renewable energy sources 1,183
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Energy policy 1,181
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Uranium ores 1,180
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Procurement 1,174
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Communication 1,170
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Floods 1,169
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Geology, Structural 1,142
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World War, 1939-1945 1,131
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Frontier and pioneer life 1,126
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Medical care 1,122
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Economic development 1,115
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Land use, Rural 1,109
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Air Pollution 1,106
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World politics 1,087
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Criminal justice, Administration of 1,078
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Computational intelligence 1,075
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Conservation of natural resources 1,072
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Streamflow 1,047
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Database management 1,041
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Outdoor recreation 1,034
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Planning 1,032
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Democracy 1,022
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Score 1,003
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Economic assistance, American 1,000
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Public health 995
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Mathematical analysis 988
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Computer vision 983
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Economic sanctions, American 977
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Educational technology 977
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Data encryption (Computer science) 976
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Interpersonal relations 973
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