Geo-EAS can be obtained upon request from the U.S. Environmental Protection Agency (Englund and Sparks, 1988). GSLIB is a modular collection of routines that can be obtained for the price of the companion usera#39;s manual (Deutsch and Journel ... Jones, T.A., D.E. Hamilton, and C. R. Johnson, 1986, Contouring Geologic Surfaces with the Computer: Van Nostrand ... D. C, 40 p. , and C.J. Huijbregts, 1978, Mining Geostatistics: Academic Press, London, 600 p. , and M.E. Rossi, 1989, anbsp;...