Creator
- United States. Bureau of Transportation Statistics2
- United States. Federal Aviation Administration2
- California. Department of Transportation. Aeronautics Program1
- County of San Mateo Information Services Department1
- Environmental Systems Research Institute (Redlands, Calif.)1
- Geological Survey (U.S.)1
- Latvian Geospatial Information Agency1
- Mono County (Calif.) -- Information Technology1
- National Atlas of the United States1