Llyfr 39,446 Trafodyn Cynhadledd 3,530 Cylchgrawn 1,649 Electronig 1,421 Dogfen y Llywodraeth 914 Cyfresol 910 Traethawd Ymchwil 305 Anhysbys 195 Cit 35 Sain 17 Llun 17 Llawysgrif 14 Pennod Llyfr 8 Deunydd Cyfeirio 8 Papur Newydd 5 Gwrthrych Ffisegol 3 Sgôr Cerddorol 2 Erthygl 1 Map 1 Gweld pob un ...

T - Technoleg 42,436

Society of Photo-optical Instrumentation Engineers 624 ebrary, Inc 440 SpringerLink (Online service) 325 ProQuest (Firm) 287 Society of Photo-Optical Instrumentation Engineers 208 International Correspondence Schools 177 Society of Manufacturing Engineers 170 IEEE Xplore (Online service) 147 Technical Association of the Pulp and Paper Industry 141 Forest Products Laboratory (U.S.) 133 Institute of Electrical and Electronics Engineers 122 American Society of Mechanical Engineers Winter Annual Meeting 111 Textile Institute (Manchester, England) 99 American Society of Mechanical Engineers Pressure Vessels and Piping Division 94 British Intelligence Objectives Sub-Committee 92 SPIE (Society) 92 Autofact 85 Davim, J. Paulo 84 Edgar Fahs Smith Memorial Collection (University of Pennsylvania) 80 National Institute of Standards and Technology (U.S.) 77 American Society for Testing and Materials 67 De Gruyter 67 Gotham Book Mart Collection (University of Pennsylvania) 67 American Foundrymen's Society 66 Adam Matthew Digital (Firm) 64 John W. Hartman Center for Sales, Advertising & Marketing History 63 American Society of Mechanical Engineers Production Engineering Division 61 International Federation of Automatic Control 60 American Management Association 59 American Welding Society 59 Gweld pob un ...

English 34,614 German 2,639 French 1,626 Russian 1,105 Japanese 879 Chinese 770 Italian 597 Spanish 492 Dutch 185 Korean 151 Polish 140 Swedish 129 Indonesian 110 Portuguese 110 Arabic 92 Czech 77 Turkish 65 Finnish 64 Undetermined 57 Danish 54 Latin 51 Multiple 48 Vietnamese 48 Hungarian 43 Persian 34 Hebrew 33 Norwegian 28 Thai 23 Slovak 22 Catalan 21 Gweld pob un ...

Congresses 4,331 Electronic books 3,477 Conference papers and proceedings 3,226 History 2,526 Periodicals 1,950 Catalogs 1,078 Handbooks, manuals, etc 816 Dictionaries 569 Handbooks and manuals 518 Exhibitions 506 Biography 436 Directories 342 Exhibition catalogs 337 Biographies 285 Electronic journals 250 Pictorial works 250 Congrès 244 Case studies 234 Sample books 207 Technical reports 172 Early works to 1800 163 Specimens 158 Statistics 149 Trade catalogs 149 Juvenile literature 115 Tables 113 Bibliography 110 Patents 100 Périodiques 90 Early works 84 Gweld pob un ...

20th century 400 19th century 193 1900-1999 110 21st century 96 18th century 77 1800-1899 65 To 1500 59 Early works to 1800 49 1900 - 1999 47 17th century 44 Geschichte 36 2000-2099 34 1883-1966 31 1800-1999 26 1939-1945 26 1700-1799 25 1814-1862 24 1768-1835 22 1800-1860 22 1765-1825 20 1732-1792 17 16th century 15 1800 - 1899 15 20e siècle 15 1900-1993 13 19e siècle 13 1747-1823 12 1919-2013 12 1893-1986 11 1898-1960 11 Gweld pob un ...

United States 1,851 Japan 687 Germany 601 China 469 Great Britain 460 France 433 Italy 378 England 288 India 262 Soviet Union 225 Europe 186 Switzerland 142 Canada 133 Russia (Federation) 118 Massachusetts 112 Pennsylvania 112 Indonesia 110 New York (State) 92 Spain 88 Netherlands 85 Korea (South) 78 Sweden 73 Finland 68 Mexico 62 Poland 61 Russia 61 Developing countries 60 Korea 60 Turkey 58 Austria 57 Gweld pob un ...