Archives 188 Sources 95 History 88 Bibliography 42 Catalogs 37 Indexes 33 Archival resources 13 Directories 9 Manuscripts 9 Public records 9 Congresses 8 Handbooks, manuals, etc 8 Libraries 8 Administration 7 Politics and government 7 Conservation and restoration 6 Foreign relations 6 Periodicals 6 World War, 1939-1945 6 Architecture 5 Correspondence 5 Data processing 5 Library science 5 Management 5 Research 5 Archival materials 4 Historiography 4 Information services 4 Letters patent 4 Universities and colleges 4