CARTNELL,E.. Valency and molecular structure E. Cartmell and G.W.A.Fowles - 4th ed. - London ELBS Butterworths 1977 - 341p. ISBN: 0-408-70922-7 (pound 2.45) Subjects--Topical Terms: CHEMISTRY Dewey Class. No.: CH 541.22 / CEn79