An electronic (interactive) version of a 1995 publication by the US Forest Service (USFS), this site is based on the National Hierarchical Framework of Ecological Units, designed to provide "a standardized method for classifying, mapping, and describing ecological units" in the US. The "Ecoregions of the United States" contains three simple color maps of the United States (including Alaska, Hawaii...

The Commission for Environmental Cooperation (discussed in the November 12, 1997 Scout Report for Science & Engineering) has just placed online this magnificent resource on the Ecological Regions of North America. Available in English, Spanish, or French, the publication may be browsed on-site or downloaded (.pdf format). Ecological Regions of North America was created as part of a major regional...

The electronic (interactive) version of a 1994 publication by the US Forest Service (USFS), this companion site is based on the National Hierarchical Framework of Ecological Units, designed to provide "a standardized method for classifying, mapping, and describing ecological units" in the US. Ecological Subregions of the United States, contains the biophysical descriptions for the color-coded...