References
- Ward , N. I. , Brooks , R. R. and Reeves , R. D. 1974 . “Effect of lead from motor‐vehicle exhausts on trees along a major thoroughfare in Palmerston North, New Zealand” . Environ. Pollut. , 6 : 149 – 158 .
- Merlini , M. and Pozzin , G. 1977 . “Lead and freshwater fishes: part 1—lead accumulation and water pH” . Environ. Pollut. , 12 : 167 – 172 .
- Ward , N. I. , Reeves , R. D. and Brooks , R. R. 1975 . “Lead in soil and vegetation along a New Zealand state highway with low traffic volume” . Environ. Pollut. , 9 : 243 – 251 .
- Waldron , H. A. 1975 . “Health standard for heavy metals” . Chemistry in Britain , 11 : 354
- Walker , C. 1976 . Environmental Pollution by Chemicals , London : Hutch‐inson, Education .
- Motto , H. L. , Daines , R. H. , Chilko , D. M. and Motto , C. K. 1970 . “Lead in soils and plants: its relationship to traffic volume and proximity to highways” . Environ. Sci. and Technol. , 4 : 231 – 234 .