The Columbia Environmental Research Center (CERC) is a U.S. Geological Survey (USGS) environmental science research facility located in Columbia, Missouri, USA. CERC conducts national and international environmental contaminant research and investigates effects of habitat alterations on aquatic and terrestrial ecosystems.
The Natural Resources Geographic Information System (NRGIS) Library is a Geographic Information System (GIS) repository developed and maintained by the GIS Section of the Iowa Department of Natural Resources (DNR).
This page lists several sources of public domain cartographic software that perform cartographic projections as well as other geodetic computations such as compute geodesic distances (Great Circles) and datum transformations.
The Nebraska Geospatial Data Center provides internet access to a wide variety of geospatial databases developed and/or maintained by various state, federal and local government agencies, academic institutions, and private entities.