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Author
- Army Map Service105
- Central Intelligence Agency96
- International Steering Committee for Global Mapping38
- United States. Bureau of the Census. Geography Division15
- California. Department of Transportation10
- MassGIS (Office : Mass.)7
- GIS Lab, Newman Library, Baruch CUNY6
- Thomas, William G., 1964-6
- MassGIS4
- Mayer, Harold M (Harold Melvin),1916-19944
- National Atlas of the United States4
- United States. Bureau of Transportation Statistics4
- unknown4
- Federal Railroad Administration (FRA)3
- General Drafting Company.3
- Hunt, Raquel3
- National Imagery and Mapping Agency.3
- Sacramento County GIS3
- Boston Street Railway Association.2
- Bureau of Transportation Statistics2