B - Philosophy, Psychology, Religion 2 152 H - Social Science 2 060 T - Technology 1 243 Q - Science 931 R - Medicine 414 K - Law 409 J - Political Science 375 L - Education 348 S - Agriculture 347 D - World History 339 P - Language and Literature 298 M - Music 296 Z - Library Science 191 N - Fine Arts 178 G - Geography, Anthropology, Recreation 169 C - Historical Sciences 94 E - United States History 93 A - General Works 88 U - Military Science 81 F - General American History 80 V - Naval Science 20 Visa alla ...

Society of Photo-optical Instrumentation Engineers 335 Cold Spring Harbor Laboratory 85 American Society of Mechanical Engineers 69 African Methodist Episcopal Church Virginia Conference 64 Institute of Electrical and Electronics Engineers 50 Sallie Bingham Center for Women's History and Culture 32 International Labour Office 30 IS & T--the Society for Imaging Science and Technology 28 Barreau du Québec Formation permanente 26 Association for Computing Machinery 24 National Institutes of Health (U.S.) 24 National Institute of Standards and Technology (U.S.) 22 Pan American Union 22 African Methodist Episcopal Church Baltimore Conference 21 Food and Agriculture Organization of the United Nations 21 American Association for the Advancement of Science 20 African Methodist Episcopal Church General Conference 18 Academy of Management 17 IEEE Computer Society 17 American Society of International Law Annual Meeting 16 American Water Works Association Conference 16 Inter-parliamentary Union Conference 16 African Methodist Episcopal Zion Church Philadelphia Conference 15 American Marketing Association 15 Cognitive Science Society (U.S.) Conference 15 IEEE Power Engineering Society 15 International Labour Organisation Programme of Industrial Activities 15 Methodist Protestant Church (U.S. : 1830-1939) Colorado Texas District, Colored 15 United States Public Health Service 15 Materials Research Society 14 Visa alla ...

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20th century 56 1945- 34 1991- 27 18th century 22 Civil War, 1861-1865 21 19th century 17 1900-1999 12 21st century 11 1989- 8 Since 1991 8 1789-1900 7 1947- 7 1900 - 1999 6 Revolution, 1775-1783 5 Since 1945 5 17th century 4 1893-1957 4 1939-1945 4 1945-1989 4 1990- 4 2000-2099 4 Renaissance, 1450-1600 4 1450-1699 3 16th century 3 1700 - 1900 3 1700-1799 3 1700-1900 3 1800-1899 3 1860-1904 3 1865-1950 3 Visa alla ...

United States 2 053 Canada 214 Russia (Federation) 166 New York (State) 154 India 152 North Carolina 148 Virginia 145 Texas 121 Great Britain 116 Pennsylvania 103 Georgia 101 Germany 101 Ohio 95 Illinois 88 California 82 Asia 81 Africa 78 Europe 77 Southern States 75 China 73 France 73 Alabama 72 Oklahoma 68 Iowa 67 Maryland 66 Massachusetts 65 Indiana 63 Japan 63 Kentucky 61 Michigan 52 Visa alla ...