Guide to reference material : Vol. 1. Science & technology / Walford, A. J. (Albert John) Library Association. Reference books Bibliography. Z1035.1 .W33 011 WAG Editor: 1959-1977 A.J. Walford. Issued in 3 v., 2nd ed.-3rd ed. Vol. issued in 1959 has supplement. London : Library Association ; New York, N.Y. : Distributed in the U.S.A. by R.R. Bowker, 1973. 1973. 1973 Text Collection 3 v. ; eng Walford's guide to reference material