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3. Bailey's Ecoregions and Subregions of the United States, 2004 Polygon Stanford University Public content

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.

4. Breeding Bird Survey Route Locations for Lower 48 States, 1966-1998 Line Stanford University Public content

1966. Patuxent Wildlife Research Center. This line shapefile portrays the current routes used for conducting Breeding Bird Surveys in the lower 48 States. This layer is part of the 1997-20... National Atlas of the United States.

8. Classification of Forest Fragmentation in North America, 1992 Raster Stanford University Public content

1992. Ritters, Kurt. This raster layer is a grid map of North America including the Caribbean and most of Mexico in GeoTIFF format. The map layer is an excerpt from a g... National Atlas of the United States.