History 330 History and criticism 124 Books 99 Classification 83 Classification, Library of Congress 75 Politics and government 68 Criticism and interpretation 64 more ... Social conditions 63 MARC formats 60 African Americans 57 Women 49 Foreign relations 48 Social life and customs 47 Libraries 42 Indigenous peoples 41 Conservation and restoration 38 World War, 1939-1945 34 Books and reading 33 Data processing 32 Subject headings 32 Race relations 29 Children 27 Gender identity 26 Law and legislation 26 Study and teaching 25 Cataloging 23 American literature 22 Archives 22 Intellectual life 22 Medicine 22 less ...