An introduction to subject indexing / A.G. Brown, in collaboration with D.W. Langridge and J. Mills. Brown, A. G. Langridge, Derek Wilton. Mills, J. Subject cataloging Programmed instruction. Indexing Programmed instruction. Z695 .B87 1982 025.47 19 BRI Includes index. London : Bingley, 1982. 1982. 1982 Text 250 p. : eng