Bibliography 120,946 History 54,353 Sources 16,727 Catalogs 15,873 Periodicals 12,832 History and criticism 10,924 Rare books 7,018 Manuscripts 6,470 Archives 6,227 Music 6,141 Government publications 5,741 Law 5,731 Library 5,431 Imprints 5,381 Early printed books 4,848 Study and teaching 4,815 Politics and government 4,742 Libraries 4,628 Dissertations, Academic 4,610 Science 4,598 Research 4,535 Printing 4,417 Incunabula 4,040 Education 3,943 Biography 3,635 Economic conditions 3,561 English literature 3,557 Medicine 3,482 Criticism and interpretation 3,405 Books 3,158 Maps 3,018 Bibliographie 2,916 Children's literature 2,866 Geology 2,795 Agriculture 2,714 Women 2,672 American literature 2,598 Jews 2,543 Booksellers' catalogs 2,537 Social sciences 2,497 Antiquities 2,478 Indexes 2,403 Civilization 2,355 Books and reading 2,318 Church history 2,247 Social conditions 2,222 Theology 2,221 Literature 2,164 Architecture 2,124 Chinese literature 2,118 Technology 2,109 Art 2,089 Private libraries 2,043 Reference books 2,023 German literature 2,020 Philosophy 1,989 Political science 1,936 Union catalogs 1,930 Economics 1,923 Histoire 1,913 Exhibitions 1,722 Bibliography of bibliographies 1,689 Publishers and publishing 1,667 Bio-bibliography 1,648 Russian literature 1,632 Economic history 1,618 Children 1,605 French literature 1,604 Foreign relations 1,596 World War, 1939-1945 1,541 Directories 1,515 Statistics 1,515 History, Local 1,508 Publishers' catalogs 1,493 City planning 1,490 Historiography 1,481 African Americans 1,473 Description and travel 1,466 Union lists 1,449 Intellectual life 1,445 Ethnology 1,414 Genealogy 1,389 Theater 1,388 Abstracts 1,376 Indians of North America 1,376 Information services 1,278 Religion 1,262 Botany 1,245 Illustrated books 1,238 International relations 1,226 Italian literature 1,223 Economic aspects 1,220 Early works to 1800 1,204 Best books 1,199 Bibliographical literature 1,195 Geography 1,179 Criticism, interpretation, etc 1,171 Spanish literature 1,151 history 1,148 Library science 1,120