Bates College
MIT Earth Resources Lab
Colorado School of Mines
OpenGIS Symposium
Mass GIS Symposium
MIT Digital Othophoto Browser
USGS : United States Geologic Survey
USGS : Topographic Maps
USGS : Maps of the United States
USGS : Historic Maps of New England and New York
CSIL : California Spatial Information Library
Sensors and Software , Manufacturer of GPR systems, leader in combating ultra-conservative NTIA/FCC regulations, member of GPR Manufacturers' Coalition.
GSSI: manufacturer of GPR systems; member of GPR Industry Coalition, combatting ultra-conservative NTIA/ FCC regulations.
Infrasense , RSI's partner in infrastructure evalutaion; co-organizer of the GPR Service Provider's Coalition and co-leader in combatting ultra-conservative NTIA/FCC regulations that are bad for small businesses.
GPR Website , by Gary Olhoeft, leader of save-GPR movement and member of the GPR Service Providers Coalition. Dr. Olhoeft is one of the innovators of the GPR industry, with his research being decades ahead of the rest of the industry.
Yahoo Geology and Geophysics Page
Environmental Professional's Guide to the Net