Books 62 Classification 61 Classification, Library of Congress 61 History 23 Law 14 Subject headings, Library of Congress 7 Books and reading 5 more ... America 4 General works 4 Literature 4 Philology 4 African Americans 3 American literature 3 Analyse documentaire 3 Bibliography 3 Catalogs 3 Communication 3 Descriptive cataloging 3 Ecclesiastical law 3 English literature 3 International law 3 Libraries 3 Library 3 Linguistics 3 Photograph collections 3 Political science 3 Prints, American 3 Rare books 3 Religious law and legislation 3 Social sciences 3 less ...