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2004. United States. Forest Service. This polygon shapefile is commonly called Bailey's ecoregions and shows ecosystems of regional extent in the United States, Puerto Rico, and the U.... National Atlas of the United States.
2001. California. Department of Fish and Game. Marine Resources Region and United States. Forest Service. This polygon shapefile consists of over twenty-six thousand California lakes with the primary focus on those water bodies located in the High Sierr... California. Department of Fish and Game. Marine Resources Region.