Aquatic Toxicology and Hazard Assessment : Proceedings of the Fourth Annual Symposium on Aquatic Toxicology. A symposium sponsored by ASTM Committee E-35 on Pesticides American Society for Testing and Materials. Chicago, Ill., 16-17 Oct. 1979. Philadelphia : American society for testing and materials, 1981. 471 s. ASTM special technical publication ; 737.