Book excerpt: This fascinating volume offers thorough descriptions of sci-tech library networks in which their members have a common sponsorship or ownership. Library networks exist in such great quantity and diversity now, that it is not difficult to identify many types of them. Corporate library networks--AT&T, Xerox, and General Electric--and federal government networks--NASA and FEDLINE--are the focus here, as the authors present the history, development, and activities of these networks. A library network for health sciences libraries that use OCLC is also scrutinized.