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- City of Baltimore, Maryland3
- Environmental Systems Research Institute (Redlands, Calif.)3
- Oak Ridge National Laboratory3
- United States. Bureau of Transportation Statistics3
- Legislative Coordinating Commission2
- National Atlas of the United States2
- United States. Bureau of the Census. Geography Division2
- United States. Department of State. Humanitarian Information Unit2
- Bright, Edward A.1
- Chester County GIS Department1
- Chester County Planning Commission1
- Coleman, Phillip R. 1
- DeLorme Publishing Company1
- Environmental Systems Research Institute Data Set,1
- Esri1
- Garmin International, Inc.1
- Iron County GIS Office1
- Lynn Gaines1
- Rawson, Peg1
- Rose, Amy N.1