Reference services (Libraries) 17 Information services 4 Electronic reference services (Libraries) 3 Cataloging 2 Classification-Books 2 College libraries 2 Information resources 2 Internet in library reference services 2 Reference books 2 United States 2 Abstracting and indexing services 1 Academic libraries 1 Administration 1 Bibliography 1 Case studies 1 Computer programs 1 Electronic reference services (Libraries)-Handbooks, manuals, etc 1 Electronic reference services(Libraries) 1 Five Laws-- Reference Service-- Library Classification-- Library Cataloguing-- Book Selection-- Book Order 1 Information retrieval 1 Information technology 1 Informaton service 1 Instant messaging 1 Instant messaging-Library applications 1 Libraries and readers 1 Libraries automation 1 Libraries-Circulation 1 Library administration 1 Library circulation and loans 1 Library research 1