Encyclopedia of information systems and services: A guide to information storage and retrieval services, data base producers and publishers, on-line venders, Computer Service Companies, Computerized Retrieval Systems, Micrographic Firms, Libraries, Government Agencies, Networks and Consortia, Information Centers, Data Banks, Clearinghouses, Research Centers, Associations and Consultants. 3rd edn (edited by Anthony T. Kruzas). Gale Research Co., Detroit. 1978. xvi + 1030 pp. $95.00