Libraries 587 Library science 310 Academic libraries 292 Automation 195 Congresses 190 Bibliography 182 Public libraries 114 History 110 Catalogs 103 Information services 102 Library administration 89 Directories 86 Library cooperation 79 Periodicals 73 School libraries 66 Library education 63 Special collections 63 Library resources 58 Administration 55 Data processing 53 Information storage and retrieval systems 53 Handbooks, manuals, etc 50 Information science 47 Acquisitions (Libraries) 46 Libraries and readers 45 Library architecture 45 Library catalogs 44 Library information networks 43 Reference services (Libraries) 37 Research 36