Books Classification 282 History 202 Classification, Library of Congress 113 Conservation and restoration 83 Printing 77 Books and reading 50 more ... Book industries and trade 47 Libraries 38 Library materials 35 Law 30 Cataloging 27 Manuscripts 27 Bibliography 24 History and criticism 23 Publishers and publishing 23 Social aspects 22 Bookbinding 20 Subject headings 19 Paper 18 Book collecting 17 Library science 17 Periodicals 15 Intellectual life 14 Manuscripts, Medieval 13 Preservation 13 American literature 11 Archival materials 11 English literature 11 Literature 11 less ...