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765 Rules and practice 742 Appropriations and expenditures 463 Manufacturing industries 461 Evaluation 446 Water quality 371 Management more ... 355 Auditing 337 Geology 318 National security 293 Officials and employees 275 Wildlife refuges 260 Groundwater 259 United States Foreign relations 240 Emergency management 240 Water quality management 230 Water Pollution 226 Social security 198 Stream measurements 193 Wildlife conservation 184 Mines and mineral resources 180 United States 175 History 174 Procurement 173 Taxation Law and legislation 170 Groundwater Pollution 161 Hydrogeology 159 Consumer protection 151 Planning 148 Water-supply 145 Medicare see all ... less ...

4,977 Geological Survey (U.S.) 1,560 National Renewable Energy Laboratory (U.S.) 922 United States. Environmental Protection Agency. Office of Water 913 United States. Government Accountability Office 865 United States. Department of State 797 U.S. Fish and Wildlife Service more ... 685 United States. Congress. Joint Committee on Taxation 588 United States. Bureau of the Census 569 United States. Congressional Budget Office 535 United States. Environmental Protection Agency 450 Army War College (U.S.). Strategic Studies Institute 364 United States. Agency for Healthcare Research and Quality 360 United States. National Park Service 347 Centers for Disease Control and Prevention (U.S.) 343 United States. Internal Revenue Service 328 United States 320 United States. Agricultural Research Service 297 National Center for Education Statistics 287 United States. Forest Service 284 Smithsonian Institution 264 National Center for Health Statistics (U.S.) 242 Center for Drug Evaluation and Research (U.S.) 241 United States. Congress. House. Committee on Rules 240 National Institute of Standards and Technology (U.S.) 229 United States. Animal and Plant Health Inspection Service 222 United States. Department of Agriculture. Economic Research Service 219 United States. Federal Trade Commission. Office of Consumer and Business Education 215 Center for Biologics Evaluation and Research (U.S.) 215 United States. National Marine Fisheries Service 214 United States. Federal Bureau of Investigation see all ... less ...

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6,125 E - United States History 4,623 H - Social Science 3,951 K - Law 2,551 C - Historical Sciences 2,543 A - General Works 2,218 S - Agriculture more ... 1,264 J - Political Science 1,257 G - Geography, Anthropology, Recreation 1,080 D - World History 1,021 T - Technology 762 F - General American History 704 L - Education 581 P - Language and Literature 466 N - Fine Arts 336 V - Naval Science 306 Q - Science 63 U - Military Science 51 R - Medicine 12 Z - Library Science 7 B - Philosophy, Psychology, Religion see all ... less ...