A new guide to modern valency theory, [by] G. I. Brown; with a foreword by L. E. Sutton. Brown, G. I. (George Ingham) Valence (Theoretical chemistry) QD469 .B65 1972 541.396 BRN First ed. published in 1953 under title: A simple guide to modern valency theory. Includes index. London : Longman, 1973. 1973. 1972 Text ix, 238, [4] p. : eng