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Periodicals 577 Research 420 Mines and mineral resources 335 Engineering 292 Mineral industries 271 Aeronautics 250 Pollution 234 more ... Environmental aspects 186 Directories 178 Equipment and supplies 171 Standards 162 Building 158 Photography 156 Power resources 154 Water-supply 150 Estimates 149 Water resources development 147 Technology 135 Congresses 131 Environmental protection 130 Astronautics 125 Design and construction 124 Testing 123 Coal mines and mining 120 Statistics 120 Roads 118 Safety measures 118 Materials 114 Automobiles 109 Air 105 less ...

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Pennsylvania State University 2,326 West Virginia University 1,888 Rutgers University 1,587 University of Pittsburgh 1,372 Lehigh University 967 Temple University 802 more ... State Library of Pennsylvania 759 Carnegie Mellon University 401 Bucknell University 312 New York University 295 Montclair State University 236 Drexel University 190 Commonwealth University of Pennsylvania 171 Lafayette College 153 Villanova University 153 Indiana University of Pennsylvania 140 Franklin and Marshall College 88 Muhlenberg College 79 Widener University 76 Thomas Jefferson University 72 Pennsylvania Western University 70 Marshall University 69 The New School 59 Duquesne University 44 Philadelphia Museum of Art 42 West Chester University 41 Bryn Mawr College 39 Haverford College 37 Millersville University 35 The Cooper Union 31 see all ... less ...

Serial Government Document 2,007 Electronic 125 Thesis 7 Map 4

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United States. Bureau of Mines 181 Geological Survey (U.S.) 79 United States. Federal Aviation Administration 72 United States. Department of Energy 63 R.S. Means Company 57 United States. National Aeronautics and Space Administration 54 more ... United States. Environmental Protection Agency 48 United States. Energy Information Administration 47 United States. Internal Revenue Service 44 United States. Patent and Trademark Office 40 Institute of Electrical and Electronics Engineers 37 American Society for Testing and Materials 35 Society of Automotive Engineers 35 United States. Army. Corps of Engineers 33 United States. Bureau of Reclamation 33 American Society of Mechanical Engineers 32 United States. Department of Energy. Office of Energy Technology 32 United States. Federal Highway Administration 31 American Society of Heating, Refrigerating and Air-Conditioning Engineers 30 United States. Environmental Protection Agency. Office of Air Quality Planning and Standards 30 National Research Council (U.S.). Highway Research Board 29 United States. National Highway Traffic Safety Administration 29 United States. Mine Safety and Health Administration 28 National Research Council (U.S.). Transportation Research Board 27 New Jersey. Department of Environmental Protection 27 United States. Office of Energy Markets and End Use 27 American Society for Testing Materials 25 National Institute of Standards and Technology (U.S.) 25 ScienceDirect (Online service) 24 Society of Photo-optical Instrumentation Engineers 24 see all ... less ...

English 8,865 German 165 Spanish 112 French 111 No linguistic content 69 Russian 45 more ... Japanese 35 Chinese 34 Multiple 20 Portuguese 18 Undetermined 13 Arabic 12 Polish 10 Italian 9 Dutch 6 Czech 4 Korean 4 Swedish 4 Romanian 3 Danish 2 Finnish 2 Hungarian 2 Indonesian 2 Persian 2 Turkish 2 Afrikaans 1 Croatian 1 Galician 1 Latvian 1 Lithuanian 1 see all ... less ...

Periodicals 4,261 Périodiques 673 Directories 614 Statistics 578 Congresses 482 Catalogs 237 more ... Electronic journals 236 Handbooks, manuals, etc 231 Periodical 212 periodicals 200 Conference papers and proceedings 163 Bibliography 109 Handbooks and manuals 98 Abstracts 96 Indexes 82 Yearbook 57 Bibliographies 54 Statistiques 52 Congrès 47 Serial publications 45 Tables 37 Dictionaries 34 Electronic books 34 Répertoires 34 Specifications 32 Biography 30 Annual reports 29 Juvenile literature 27 Telephone directories 27 Databases 26 see all ... less ...

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United States 2,240 États-Unis 245 New Jersey 231 Pennsylvania 166 Canada 158 Great Britain 89 more ... West Virginia 60 Japan 48 California 45 Colorado 41 Europe 41 New York (State) 40 China 38 Illinois 33 Australia 30 New Mexico 29 Germany 27 Philadelphia 27 Ontario 24 Maryland 22 Idaho 21 Washington (State) 21 Ohio 20 Virginia 20 Alaska 19 Nevada 19 North America 19 European Union countries 18 Outer space 18 Virginie-Occidentale 18 see all ... less ...

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