BROWN, G.I. A new guide to modern valency theory / [by] G.I.Brown - 3rd ed. - London ELBS/Longman group 1975 - 238 p. Includes appendixes and index. ISBN: 582351251 Subjects--Topical Terms: MoleculesChemical bondsTheoretical chemistry Dewey Class. No.: 541.224 / BRO