References
- Gilfillan , SC . 1965 . Lead poisoning and the fall of Rome . J Occup Med , 7 : 53 – 60 .
- Cannon , HL and Bowles , JM . 1962 . Contamination of vegetation by tetraethyl lead . Science , 137 : 765 – 766 .
- Daines , RH , Motto , H and Chilko , DM . 1970 . Atmospheric lead: Its relationship to traffic volume and proximity to highways . Environ Sci Technol , 4 : 318 – 322 .
- Lagerwerff , JV and Specht , AW . 1970 . Contamination of roadside soil and vegetation with cadmium, nickel, lead, and zinc . Environ Sci Technol , 4 : 583 – 586 .
- MacLean , AJ , Halstead , RL and Finn , BJ . 1969 . Extractability of added lead in soils and its concentration in plants . Can J Soil Sci , 49 : 327 – 334 .
- et al. Lead in soils and plants: Its relationship to traffic volume and proximity to highways Environ Sci Technol 1970 4 231 237
- Smith , WH . 1971 . Lead contamination of roadside White Pine . Forest Sci , 17 : 195 – 198 .
- Connor , JJ , Shacklette , HT and Erdman , JA . 1971 . Extraordinary trace-element accumulations in roadside cedars near Centerville, Missouri , US Geol Survey Prof Paper Vol. 750-B , B151 – B156 .