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- Stackhouse, Cecil17
- United States. Bureau of Transportation Statistics16
- Stephen P. Teale Data Center (Calif.). 8
- California. Air Resources Board. Planning and Technical Support Division6
- California Air Resources Board. Planning and Technical Support Division3
- United States. Environmental Protection Agency2
- United States. Environmental Protection Agency. Region IX2
- California Office of Statewide Health Planning and Development1
- United States. Environmental Protection Agency, Region IX1
- United States. Environmental Protection Agency. 1