Online information retrieval : an introductory manual to principles and practice / John Convey. Convey, John. Online bibliographic searching. Information retrieval. Electronic information resource searching. Z699.35.O55 C65 1992 025.04 COO "A Clive Bingley book." Includes bibliographical references (p. [252]-266) and index. London : Library Association Pub., 1992. 1992. 1992 Text viii, 310 p. : eng