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1. United States Lakes (Generalized), 1990-1992

1990. Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the major lakes within the United States at 1:5,000,000 scale. This layer is part of the 2014 ESRI Data and Maps ... Environmental Systems Research Institute (Redlands, Calif.).

2. United States Rivers (Generalized), 1990-2009

1990. Environmental Systems Research Institute (Redlands, Calif.). This line shapefile represents the major rivers within the United States at 1:5,000,000 scale. This layer is part of the 2014 ESRI Data and Maps co... Environmental Systems Research Institute (Redlands, Calif.).

3. U.S. Drainage Systems (Generalized), 1990-1992

1990. Environmental Systems Research Institute (Redlands, Calif.). This line shapefile represents the major drainage systems within United States. This layer is part of the 2014 ESRI Data and Maps collection for Ar... Environmental Systems Research Institute (Redlands, Calif.).

4. U.S. Cities 2000

1990. Environmental Systems Research Institute, Inc. (ESRI). U.S. Cities represents locations for cities within United States with populations of 10,000 or greater and all state capitals. Environmental Systems Research Institute, Inc. (ESRI).

5. U.S. Populated Place Points 2000

1990. Environmental Systems Research Institute, Inc. (ESRI). U.S. Populated Place Points represents populated places within United States identified by the U.S. Bureau of the Census. Environmental Systems Research Institute, Inc. (ESRI).

6. County Boundaries of the United States, 1990

1990. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

7. Historical United States County Boundaries, 1990

1990. Earle, Carville, Heppen, John, Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology., Otterstrom, Samuel, and Cao, Changyong. This polygon shapefile contains county boundaries for the United States in 1990. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.

8. Spread of Africanized Honey Bees in the United States, 1990-2005

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.

9. Nonattainment Areas for Carbon Monoxide Pollution: United States and Territories, 1990

1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the carbon mono... United States. Bureau of Transportation Statistics.

10. Nonattainment Areas for Nitrogen Dioxide Pollution: United States and Territories, 1990

1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the nitrogen di... United States. Bureau of Transportation Statistics.

11. Nonattainment Areas for Ozone Pollution: United States and Territories, 1990

1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the ozone (O3)1... United States. Bureau of Transportation Statistics.

12. Nonattainment Areas for Patriculate Matter Pollution: United States and Territories, 1990

1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the particulate... United States. Bureau of Transportation Statistics.