Libraries are using computers and telecommunications networks to share resources and centralize processing tasks. Networks allow handling of increasing amounts of material with limited funds. New developments in communications technology encourage network growth. The Ohio College Library Center is the current leader in networking. Network efforts are also in progress in New England, New York, Pennsylvania, and the Federal Library system; various commercial networking ventures are underway. Eventually, the National Commission on Libraries and Information Science hopes to establish a national library network. A directory of selected networks is appended. (PF)