References
- Motto , Harry L. , Daines , R. , Chilko , D. and Motto , C. 1970 . Lead in Soils and Plants: Its Relationship to Traffic Volume and Proximity to Highways . Environ. Sci. Tech. , 4 ( 3 ) : 231
- Scott , Christine M. December 1991 . Background Metal Concentrations in Soils in Northern Santa Clara County, California December , M.S. Thesis at the University of San Francisco, Environmental Management Program