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NetLibrary, Inc 16,837
National Renewable Energy Laboratory (U.S.) 5,442
National Institute of Standards and Technology (U.S.) 3,939
National Center for Education Statistics 2,960
NASA Glenn Research Center 2,839
National Center for Health Statistics (U.S.) 2,527
National Energy Technology Laboratory (U.S.) 2,283
National Center for Research in Vocational Education (U.S.) 1,809
National Science Foundation (U.S.) 1,622
National Institutes of Health (U.S.) 1,459
National Institute of Justice (U.S.) 1,280
National Institute for Occupational Safety and Health 1,279
New York (State) 1,167
North Atlantic Treaty Organization. Scientific Affairs Division 1,162
National Agricultural Library (U.S.) 1,126
Northwest Regional Educational Laboratory 1,086
Northeastern Forest Experiment Station (Radnor, Pa.) 1,076
National Cancer Institute (U.S.) 976
North Central Forest Experiment Station (Saint Paul, Minn.) 967
NBC Television Network 936
New Video Group 927
National Research Council (U.S.). Transportation Research Board 920
National Educational Association (U.S.) 872
New York Public Library 798
National Public Radio (U.S.) 783
National Archives (Great Britain) 779
Newberry Library 740
National Council of Teachers of English, Urbana, IL 737
National Institute of Mental Health (U.S.) 725
New York Philharmonic 711
National Institute on Drug Abuse 692
National Academies Press (U.S.) 685
National Academy of Sciences (U.S.) 616
National Water-Quality Assessment Program (U.S.) 610
National Assessment of Educational Progress (Project) 583
New Jersey 578
New York Academy of Sciences 578
National Industrial Conference Board 566
National Research Council (U.S.) 561
National Institute of Education (U.S.) 551
New Jersey. Legislature. General Assembly 516
New York (State). Supreme Court 492
National Association of Secondary School Principals, Reston, VA 486
Nielsen, Carl, 1865-1931 484
National Gallery of Art (U.S.) 482
National Defense University. Institute for National Strategic Studies 443
National Institute on Aging 438
National Film Board of Canada 436
National Archives and Records Service 416
National Geographic Society (U.S.) 414
New York City Board of Education, Brooklyn, NY. Office of Educational Evaluation 411
New Hampshire 402
National Center for Research in Vocational Education, Berkeley, CA 394
National Institute of Law Enforcement and Criminal Justice 387
National Cooperative Highway Research Program 380
New Philharmonia Orchestra 379
North Carolina 378
National Geographic Television & Film 368
National Association of State Directors of Special Education (U.S.) 363
National Risk Management Research Laboratory (U.S.) 356
National Institute on Alcohol Abuse and Alcoholism (U.S.) 353
National Centre for Vocational Education Research, Leabrook (Australia) 346
National Academies of Sciences, Engineering, and Medicine (U.S.). Health and Medicine Division 333
New York City Board of Education, Brooklyn, NY. Office of Research, Evaluation, and Assessment 325
National Geographic Society (U.S.). Cartographic Division 324
New York (State). General Assembly 321
North Carolina. Department of Public Instruction 319
Norway. Statistisk sentralbyrå 316
National Academy of Engineering 308
Nigeria 300
New York (State). Legislature. Assembly 297
North Carolina. General Assembly. House of Commons 297
National Institute of Child Health and Human Development (U.S.) 295
Newton, John, 1725-1807 294
National Ocean Survey 289
National Climatic Data Center (U.S.) 280
National Toxicology Program (U.S.) 277
Nixon, Richard M. (Richard Milhous), 1913-1994 275
Nations, United 267
New York (State). Legislature 263
National Bureau of Economic Research 257
Necker, Jacques, 1732-1804 255
New York (State). Court for the Trial of Impeachments and the Correction of Errors 252
National Council of Teachers of English, Champaign, IL 251
National Catholic Educational Association, Washington, DC 247
National Association of Coll. and Univ. Business Officers, Washington, DC 242
National Science Foundation (U.S.) Division of Science Resources Studies 238
National Heart, Lung, and Blood Institute 235
Newton, Isaac, 1642-1727 235
National Council of Teachers of Mathematics, Inc., Reston, VA 234
National Broadcasting Company 232
New York City Board of Education, Brooklyn, NY. Div. of Curriculum and Instruction 231
New York City Board of Education, Brooklyn. Office of Educational Assessment 230
Nigerian Institute of Social and Economic Research 228
National Defense University. Center for Technology and National Security Policy 227
Naval Research Laboratory (U.S.) 223
Nordiska Afrikainstitutet 219
National Gallery (Great Britain) 218
New-York Historical Society 218
Northeast Fisheries Science Center (U.S.) 217