Classification Books 1,626 Classification, Library of Congress 593 Livres 181 Law 173 Cataloging 123 History 116 more ... Bibliography 113 Book Classification 113 Subject headings 108 Classification de la Bibliothèque du Congrès 66 Library science 64 Medicine 50 Government publications 48 Classification, Decimal 47 Social sciences 46 Science 43 Indexing 41 Catalogage 39 Information storage and retrieval systems 39 Literature 39 Philology 39 Political science 35 Subject cataloging 34 Classification, Dewey decimal 32 Methodology 31 Information organization 27 International law 26 Maps 26 Geography 25 less ...