Llyfr 54,430 Trafodyn Cynhadledd 3,991 Electronig 2,846 Cylchgrawn 2,303 Dogfen y Llywodraeth 1,674 Cyfresol 1,252 Traethawd Ymchwil 843 Anhysbys 224 Llun 96 Deunydd Cyfeirio 29 Llawysgrif 28 Cit 14 Sain 11 Papur Newydd 11 Pennod Llyfr 6 Gwrthrych Ffisegol 6 Map 4 Gweld pob un ...

T - Technoleg 58,559

Edgar Fahs Smith Memorial Collection (University of Pennsylvania) 739 ebrary, Inc 734 SpringerLink (Online service) 643 ProQuest (Firm) 504 American Institute of Chemical Engineers 397 American Chemical Society Meeting 395 Dupee Fireworks Collection (Brown University) 380 Wiley InterScience (Online service) 252 Faber Birren Collection (Yale University) 228 Oak Ridge National Laboratory 203 De Gruyter 190 Massachusetts Institute of Technology David H. Koch School of Chemical Engineering Practice. Oak Ridge Station 180 Culinary Collection (University of Pennsylvania) 173 Institution of Chemical Engineers (Great Britain) 173 Royal Society of Chemistry (Great Britain) 165 United States Office of Saline Water 161 ScienceDirect (Online service) 158 American Chemical Society 153 American Chemical Society Division of Agricultural and Food Chemistry 152 American Institute of Chemical Engineers Center for Chemical Process Safety 141 Chef Fritz Blank Culinary Archive and Library (University of Pennsylvania) 129 Adam Matthew Digital (Firm) 124 British Intelligence Objectives Sub-Committee 123 American Society for Testing and Materials 121 Society of Photo-optical Instrumentation Engineers 114 United States General Accounting Office 112 Alumni and Friends Memorial Book Fund 105 United States Bureau of Mines 105 United States Department of Energy 103 American Chemical Society Division of Industrial and Engineering Chemistry 102 Gweld pob un ...

English 49,144 German 3,784 French 2,820 Russian 882 Spanish 786 Italian 692 Chinese 612 Japanese 462 Portuguese 241 Korean 195 Indonesian 144 Dutch 130 Czech 118 Polish 108 Hungarian 82 Swedish 78 Latin 77 Arabic 72 Greek 68 Undetermined 59 Multiple 58 Hebrew 50 Vietnamese 47 Danish 42 Persian 37 Thai 35 Romanian 32 Turkish 31 Finnish 21 Georgian 20 Gweld pob un ...

Congresses 5,366 Electronic books 5,290 Conference papers and proceedings 4,258 Periodicals 2,898 History 1,943 Handbooks, manuals, etc 1,276 Catalogs 980 Dictionaries 869 Handbooks and manuals 832 Technical reports 688 Early works to 1800 401 Directories 387 Biography 379 Electronic journals 353 Guidebooks 327 Patents 324 Biographies 233 Periodical 229 Early works 224 Tables 215 Encyclopedias 201 Amateurs' manuals 189 Congress 189 Bibliography 182 Guides, manuels, etc 180 Périodiques 165 Pictorial works 162 Statistics 158 Electronic book 144 Exhibitions 141 Gweld pob un ...

20th century 234 19th century 168 Early works to 1800 109 18th century 75 To 1500 72 1833-1896 64 17th century 57 1900-1999 51 21st century 46 1939-1945 34 Geschichte 30 16th century 26 1800-1899 23 2000-2099 20 1800-1999 17 1900 - 1999 15 1700-1799 14 Elizabeth, 1558-1603 14 1945- 13 1800 - 1899 9 1838-1907 9 1558-1603 8 1600-1699 8 20e siècle 8 James I, 1603-1625 8 1700-1899 7 1743-1826 7 1777-1866 7 1812-1869 7 1861-1935 7 Gweld pob un ...

United States 1,989 France 1,065 Germany 620 Italy 423 California 388 Great Britain 366 China 362 Japan 300 Europe 278 India 249 Canada 210 Australia 184 England 179 Spain 170 Mexico 142 New York (State) 140 Indonesia 132 Developing countries 118 Brazil 117 South Africa 109 Korea (South) 108 Soviet Union 106 Pennsylvania 96 Burgundy 94 Portugal 90 Russia (Federation) 87 Korea 84 Greece 83 Nigeria 74 Asia 64 Gweld pob un ...