gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1969.037.286.40 Book Reviews Principles of Geology H. R. A. 6 1969 37 286 308 308 Gilluly James Waters Aaron C. Woodford A. O. Principles of Geology 1968 San Francisco and London W. H. Freeman & Co. (Third edition.) vii+687 pp., 520 figs., 1 pl. Price 65s Copyright © 1969, The Mineralogical Society 1969