The Council for Agricultural Science and Technology (CAST) was formed in 1972 as a result of a meeting sponsored by the National Academy of Sciences' National Research Council. CAST's mission is to "assemble, interpret, and communicate credible science-based information regionally, nationally, and internationally to legislators, regulators, policymakers, the media, the private sector and the...

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...