Libraries 560 Publishers and publishing 345 Information services 333 Library resources 236 Directories 202 Periodicals 186 Booksellers and bookselling 183 more ... Book industries and trade 177 History 162 Bibliography 148 Archival resources 131 Special libraries 123 Répertoires 114 Societies, etc 105 Bibliothèques 102 Web sites 96 Publishing 94 Archives 78 Librarians 78 Information storage and retrieval systems 72 Databases 71 Computer network resources 69 Library science 69 Internet addresses 68 American periodicals 67 Antiquarian booksellers 67 American newspapers 61 Study and teaching 55 Services d'information 54 Education 51 less ...