1. Ames, B.N., et al. 1975. Mutation Research 31: 347–364.
2. Black, J., et al. Bull, of Env. Cont. and Tox. (in press).
3. Commoner, B., et al. 1976. EPA Report 600/1–76–022 Gov. Print. Off., Wash., D.C.
4. Dunn, B., and H.F. Stich, 1976. J. Fisheries Research Board of Canada, 13: 2040–2046.
5. Environmental Protection Agency, Report No. 905/9–74–100.