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Ecological Subregions: Provinces, Sections, and Subsections of the Conterminous United States 2007
Click on the image to go to the US Ecological Subregions website.
The 2007 Section and Subsection map and associated data issued by the USDA Forest Service Washington Office-Ecosystem Management Coordination staff are our official inventory of ecological units at the subregional scale and refine our inventory at the regional scale.
Geospatial One Stop
Click on the image to go to the US Ecological Subregions website.
Your one stop for finding federal, state, and local geographic data...  (multi-agency data depot)
Image Archive
Links to the Image Archive website.
The Foreign Agricultural Service serves as the repository and manager of the USDA Satellite Imagery Archive. The USDA Imagery Archive is the repository for all acquired USDA satellite imagery. The Archive was established in 2001 as a cost-sharing agreement among the various subscribers.