This is the most comprehensive listing of commercial earth science, mining & related software available. The format includes the name & address of the vendor, short software description, hardware requirements, & price. Approximately 36 categories of software are covered related to mining, geology, geophysics, economics, hydrology, environmental, mineral processing, geographic information systems, & more. The listings cover programs written for all types of computers from PCs to mainframes. The DIRECTORY is indexed by program name, by vendor & by key words. A companion volume is titled PUBLIC DOMAIN SOFTWARE FOR EARTH SCIENTISTS, which contains information primarily on public domain software & inexpensive (less than $500) commercial packages. Software information has been collected from government agencies, universities & individuals. A VARIOGRAM PRIMER is one of a series of how-to books for analyzing earth science data.Variogram calculation is the first step in a geostatistical analysis & has been applied in minerals, agriculture, forestry, hazardous waste contamination studies, vegetation, & other spatial data. The primer bridges the gap between theory & actual practice.