Book 50,875 Government Document 11,649 Conference Proceeding 3,521 Serial 2,701 Journal 1,737 Electronic 1,689 Thesis 756 Unknown 202 Map 53 Book Chapter 23 Kit 17 Manuscript 15 Reference Material 9 Photo 6 Newspaper 4 Article 3 Audio 2 Musical Score 1 Physical Object 1 see all ...

T - Technology 55,880

United States Bureau of Mines 6,001 Geological Survey (U.S.) 767 United States National Aeronautics and Space Administration 310 ebrary, Inc 282 American Association of Petroleum Geologists 220 Canada Mines Branch 217 Edgar Fahs Smith Memorial Collection (University of Pennsylvania) 211 United States Minerals Management Service. Gulf of Mexico OCS Region 209 American Society for Metals 169 Illinois State Geological Survey 163 ProQuest (Firm) 151 United States General Accounting Office 130 Langley Research Center 129 Safety in Mines Research Establishment (Great Britain) 125 United States Mine Safety and Health Administration 122 Society of Petroleum Engineers (U.S.) 112 Institution of Mining and Metallurgy (Great Britain) 110 Fieldner, Arno Carl, 1881-1966 108 American Institute of Mining, Metallurgical, and Petroleum Engineers 104 Lewis Research Center 100 Geological Society of London 96 Minerals, Metals and Materials Society Annual Meeting 94 ASM International 92 Society of Exploration Geophysicists 91 United States Department of the Interior 80 Canada Mines Branch (1901-1936) 79 University of Alabama 79 United States Bureau of Land Management 77 United States Congress. Senate. Committee on Interior and Insular Affairs 76 University of Wyoming 74 see all ...

English 45,075 Russian 3,153 German 2,593 French 2,112 Spanish 1,438 Chinese 950 Portuguese 418 Italian 293 Japanese 291 Polish 189 Indonesian 161 Arabic 106 Latin 104 Czech 100 Turkish 89 Swedish 85 Korean 78 Dutch 68 Ukrainian 57 Undetermined 53 Romanian 48 Norwegian 47 Vietnamese 47 Hungarian 41 Croatian 40 Greek 37 Multiple 35 Persian 28 Slovak 26 Danish 19 see all ...

Congresses 3,904 Periodicals 2,927 Conference papers and proceedings 2,833 History 2,039 Electronic books 1,555 Statistics 684 Dictionaries 490 Handbooks, manuals, etc 439 Biography 401 Bibliography 362 Early works to 1800 350 Handbooks and manuals 311 Directories 264 Biographies 240 Maps 206 Academic theses 195 Early works 190 Pictorial works 183 Guidebooks 167 Bibliographies 149 Technical reports 138 Printed ephemera 134 Electronic journals 122 Thèses et écrits académiques 118 Périodiques 99 Catalogs 96 Tables 95 Congrès 92 Government publications 90 Périodiques 85 see all ...

20th century 225 19th century 185 Early works to 1800 106 1900-1999 90 18th century 75 To 1500 64 Cretaceous 56 1800-1899 51 1494-1555 45 Carboniferous 43 Precambrian 39 Tertiary 35 16th century 32 21st century 31 Paleozoic 30 Cenozoic 28 Pennsylvanian 28 Devonian 27 Permian 27 17th century 26 1800-1999 24 Jurassic 22 1700-1799 21 Mesozoic 21 From 280 to 345 million years ago 19 From 570 million to 5 billion years ago 18 Geschichte 18 1700-1899 16 1900 - 1999 16 19e siècle 16 see all ...

United States 3,323 China 850 California 788 Pennsylvania 694 Canada 630 Australia 624 Russia (Federation) 612 Germany 581 Soviet Union 557 India 511 Alaska 486 New Mexico 441 Colorado 433 Great Britain 428 France 407 Mexico 370 Brazil 362 Idaho 345 South Africa 336 Texas 332 England 327 Arizona 324 Nevada 318 Illinois 301 Europe 258 Utah 251 Ontario 250 Wyoming 242 Indonesia 241 Montana 239 see all ...