An introduction to the principles of chemistry, by L. H. Cragg and R. P. Graham. Cragg, L. H. (Laurence Harold), 1912- Graham, R. P. (Ronald Powell), 1915- joint author. Chemistry, Physical and theoretical. QD453 .C758 1954 540 19 CRI Toronto, Clarke, Irwin, 1954. 1954. 1954 Text 740 p. : eng