Geology links
National and International Societies and Surveys
U.S. Geological Survey (USGS) Geological Survey of Canada (GSC) Geological Society of America (GSA) American Geophysical Union (AGU) Mineralogical Society of America (MSA) International Glaciological Society (IGS) American Association of Petroleum Geologists (AAPG) Society for Sedimentary Geology (SEPM) Geological Association of Canada (GAC) Mineralogical Association of Canada (MAC)
Regional Societies and Surveys
Minnesota Geological Survey Wisconsin Geological and Natural History Survey Iowa Geological Survey South Dakota Geological Survey North Dakota Geological Survey Institute on Lake Superior Geology
Databases and Imagery
NASA World Wind Google Earth National Geologic Mapping Database (NGMDB) NASA Earth from Space Image Collection Gateway to Astronaut Photography of Earth National Geophysical Data Center (NGDC) TerraServer USA Global Land Cover Facility (GLCF) Earth Science Data Interface NASA Landsat Project