圖書 1,083,210 Thesis 139,190 Conference Proceeding 106,452 Government Document 65,707 電子 42,283 雜誌 25,860 序列 23,789 未知 7,256 工具包 4,343 手稿 1,168 照片 1,052 音頻 905 Book Chapter 607 Reference Material 338 地圖 171 報紙 102 樂譜 98 實物 41 Article 10 查看所有 ...

SpringerLink (Online service) 18,770 Adam Matthew Digital (Firm) 14,309 Society of Photo-optical Instrumentation Engineers 11,850 Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science 10,710 Institute of Electrical and Electronics Engineers 9,498 ebrary, Inc 9,385 IEEE Xplore (Online service) 9,127 Massachusetts Institute of Technology Department of Mechanical Engineering 8,789 Culinary Collection (University of Pennsylvania) 8,080 United States Bureau of Mines 6,208 ProQuest (Firm) 5,986 Sloan School of Management 5,811 United States National Aeronautics and Space Administration 5,787 Chef Fritz Blank Culinary Archive and Library (University of Pennsylvania) 5,735 Laurie Burrows Grad Collection (University of Pennsylvania) 5,317 Langley Research Center 4,089 Society of Photo-Optical Instrumentation Engineers 3,518 SPIE (Society) 2,923 National Research Council (U.S.) Transportation Research Board 2,854 Geological Survey (U.S.) 2,811 United States General Accounting Office 2,638 Lewis Research Center 2,628 IEEE Computer Society 2,565 Massachusetts Institute of Technology Department of Aeronautics and Astronautics 2,510 United States Federal Highway Administration 2,267 Massachusetts Institute of Technology Department of Physics 2,176 Massachusetts Institute of Technology Department of Materials Science and Engineering 2,152 Massachusetts Institute of Technology Department of Urban Studies and Planning 2,110 Massachusetts Institute of Technology Department of Civil and Environmental Engineering 1,885 American Society for Testing and Materials 1,786 查看所有 ...

English 987,657 German 48,321 French 42,430 Russian 21,320 Spanish 20,847 Chinese 15,280 Italian 14,234 Japanese 12,120 Portuguese 5,063 Dutch 3,800 Korean 3,665 Polish 2,606 Indonesian 2,359 Arabic 1,905 Czech 1,883 Hebrew 1,826 Swedish 1,810 Vietnamese 1,808 Turkish 1,776 Multiple 1,403 Thai 1,185 Hungarian 1,015 Latin 934 Undetermined 916 Persian 907 Danish 887 Greek 816 Ukrainian 714 Finnish 701 Catalan 693 查看所有 ...

Congresses 126,806 Conference papers and proceedings 89,657 Electronic books 82,639 Periodicals 37,115 History 36,329 Exhibitions 29,501 Pictorial works 27,511 Cookbooks 18,894 Exhibition catalogs 18,677 Handbooks, manuals, etc 17,466 Technical reports 15,689 Biography 15,195 Handbooks and manuals 12,265 Catalogs 11,272 Biographies 9,214 Dictionaries 8,714 Livres de cuisine 6,918 cookbooks 6,855 Illustrated works 5,385 Directories 5,007 Congrès 4,738 Portraits 4,658 Photobooks 4,475 Statistics 4,270 Early works to 1800 3,986 Cookbook 3,721 Electronic journals 3,569 Juvenile literature 3,040 Bibliography 3,004 Academic theses 2,943 查看所有 ...

20th century 13,726 19th century 5,986 21st century 5,164 1900-1999 4,582 2000-2099 2,450 1800-1899 1,479 1900 - 1999 1,216 Early works to 1800 1,161 20e siècle 947 18th century 898 1800-1999 693 1945- 609 1946- 603 21e siècle 589 1938- 585 1944- 585 1955- 578 1952- 569 1964- 563 1900-2099 557 To 1500 555 1949- 544 1953- 532 1958- 522 1954- 518 1957- 518 1951- 484 1961- 471 17th century 460 1950- 460 查看所有 ...

United States 62,128 Great Britain 11,027 China 10,284 France 10,179 Japan 10,003 Germany 8,978 California 7,101 Italy 6,830 India 6,156 New York (State) 5,749 England 5,505 Soviet Union 4,795 Europe 4,473 Canada 4,216 Mexico 3,775 Massachusetts 3,477 New York 3,428 Russia (Federation) 3,332 Indonesia 3,307 Spain 3,197 Australia 3,130 Brazil 3,118 Pennsylvania 3,047 Developing countries 2,148 Russia 2,136 London 2,127 Netherlands 2,105 Illinois 1,996 Korea (South) 1,905 Turkey 1,848 查看所有 ...