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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.

11. Geologic Fault Formations, Arizona, 2000 Line Public content

2000. Arizona. State Land Department. This data set consists of geologic fault formations throughout the State of Arizona. Arizona State Land Department.

12. Hazardous Waste, Generated, Shipped, Received 2001-2007 Polygon Stanford University Public content

2001. National Atlas of the United States. This polygon shapefile portrays the hazardous waste generated, shipped, and received by state and other areas within the United States, Puerto Rico... National Atlas of the United States.

13. Major Rivers and Primary Tributaries, Arizona, 1993 Line Public content

1993. Arizona. State Land Department. Data layer depicts major rivers, main stem and primary reach tributaries. Converted in the fall of 1988 from USGS 1:100,000 scale DLG data to ARC f... Arizona State Land Department, Arizona Land Resources Information System.

14. National Fire Plan - Hazardous Fuels Reduction Program, 2004 Polygon Stanford University Public content

2004. National Atlas of the United States. This polygon shapefile portrays county level data for the fiscal-year-2004 National Fire Plan - Hazardous Fuels Reduction Program. The purpose of t... National Atlas of the United States.

15. National Wilderness Preservation System of the United States, 2006 Polygon Stanford University Public content

1972. National Atlas of the United States. This polygon shapefile contains National Wilderness Preservation System areas of 640 acres or more, in the United States, Puerto Rico, and the U.S.... National Atlas of the United States.

16. Omernik's Level III Ecoregions of the Continental United States, 2003 Polygon Stanford University Public content

2003. United States. Environmental Protection Agency. This polygon shapefile shows Omernik's Level III ecoregions, derived from a 1:7,500,000 map created by J.M. Omernik in 1987 and from refinements of... National Atlas of the United States.

18. Riparian Vegetation (Perennial), Arizona, 1994 Polygon Public content

1993. Arizona. Game and Fish Department. Riparian vegetation associated with perennial waters of Arizona. The dataset was created using two major sources of imagery - Landsat Thematic Mapp... Arizona State Land Department.

19. Significant United States Earthquakes, 1568-2009 Point Stanford University Public content

1568. Geological Survey (U.S.). This point shapefile contains the locations and attributes of significant, historic earthquakes that caused deaths, property damage, and geological... National Atlas of the United States.

20. Spread of Africanized Honey Bees in the United States, 1990-2005 Polygon Stanford University Public content

1990. United States. Agricultural Research Service. This polygon shapefile portrays the spread, by year, of the Africanized honey bee (AHB) in the United States, Puerto Rico, and the U.S. Virgin Isla... National Atlas of the United States.