1. Mersey and Weaver River Authority Report on the condition of the River Mersey and Adjacent Coastline (1971).
2. Mersey and Weaver River Authority, Annual Report (1973).
3. Jacobs, L. W., and Keeney, D. R., Environ. Sci. Tech., 8, 267 (1974).
4. Bouchard, A., At. Abs. Newsl., 12, 115 (1973).
5. Iskandar, I. K., Syers, J. K., Jacobs, L. W., Keeney, D. R., and Gilmour, J. T., Analyst, 97, 388 (1972).