gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1970.037.291.13 Book Reviews Potassium-Argon Dating Moorbath S. 9 1970 37 291 859 861 Dalrymple G. B. Lanphere M. A. Potassium-Argon Dating San Francisco W. H. Freeman and Company 1969 xiv +, 98 figs. Price 70s. Copyright © 1970, The Mineralogical Society 1970