D - World History 29 H - Social Science 26 J - Political Science 25 P - Language and Literature 23 N - Fine Arts 19 E - United States History 10 M - Music 5 B - Philosophy, Psychology, Religion 4 F - General American History 3 T - Technology 3 A - General Works 2 C - Historical Sciences 2 L - Education 2 U - Military Science 2 G - Geography, Anthropology, Recreation 1 K - Law 1 Q - Science 1 R - Medicine 1 Z - Library Science 1 查看所有 ...

Ivy Plus Libraries Confederation 12 Blanchard, Lauren Ploch 10 ProQuest (Firm) 8 Artifex Press 5 Martin, Michael F. 5 Gale (Firm) 4 Library of Congress Congressional Research Service 4 Sullivan, Mark P. 4 Taft-Morales, Maureen 4 Arieff, Alexis 3 Balkan Investigative Reporting Network 3 Blanchard, Christopher M. 3 Global Resources Network 3 Humud, Carla E. 3 Husted, Tomas F. 3 Meyer, Peter J. 3 Morelli, Vincent L. 3 National Security Archive (U.S.) 3 Obama, Barack 3 Seelke, Clare Ribando 3 United States President (2009-2017 : Obama) 3 Zanotti, Jim 3 Adam Matthew Digital (Firm) 2 Alexander Street Press 2 Archick, Kristin 2 Archive-It (Firm) 2 Baheyya 2 Binder, Pat, 1960- 2 Center for Public Integrity 2 Chadwyck-Healey, Inc 2 查看所有 ...

English 270 Spanish 21 Russian 19 French 10 German 8 Arabic 6 Chinese 6 Multiple 5 Ukrainian 5 Belarusian 4 Unknown 4 Italian 3 Hindi 2 Indonesian 2 Portuguese 2 Turkish 2 Danish 1 Hebrew 1 Japanese 1 Lithuanian 1 Norwegian 1 Persian 1 Polish 1 Thai 1 Urdu 1 Vietnamese 1 Welsh 1 查看所有 ...

Databases 64 History 33 Sources 32 Electronic reference sources 29 Online databases 28 Web archives 18 Newspapers 17 Internet videos 16 Blogs 14 Full-text databases 12 Periodicals 10 Statistics 10 Archives 8 Criticism, interpretation, etc 8 Bases de données 7 Web sites 7 Database 6 Biography 5 Catalogues raisonnés 5 Ephemera 5 Catalogs 4 Interviews 4 Scores 4 Video recordings 4 databases 4 African American newspapers 3 Directories 3 Drama 3 Journaux 3 Periodical 3 查看所有 ...

United States 118 China 12 Great Britain 10 Europe 8 Cuba 7 Africa 6 Hong Kong 6 Egypt 5 India 5 Nigeria 5 Ukraine 5 Afghanistan 4 Canada 4 European Union countries 4 Hong Kong (China) 4 Latin America 4 New York 4 New York (N.Y.) 4 New York (State) 4 Venezuela 4 Argentina 3 Australia 3 Balkan Peninsula 3 Bhutan 3 Caribbean Area 3 Islamic countries 3 Israel 3 Middle East 3 Russia 3 Russia (Federation) 3 查看所有 ...