from EPA Map of Radon Zones home page:
The Map was developed using five factors to determine radon potential: indoor
radon measurements; geology; aerial radioactivity; ...
Prairie Map is a GIS Database for Prairie Grassland Habitats and associated
Native Wildlife in the North American Mid-West.
The purpose of the PRAIRIEMAP project, conducted by the Snake River Field ...
The Irrigation Production Data System (IPDS) is a comprehensive
analysis system; it was developed as a tool for analyzing cost
and returns across states and U.S. farm production regions. It