1. American Public Health Ass.: Standard methods for the examination of water and wastewater. 13 ed. New York: Publ. Health Assn., Inc. (1971).
2. Armour, J.A., and J.A. Burke: Method for separating polychlorinated biphenyls from DDT and its analogs. J. Ass. Offic. Anal. Chem.53, 761 (1970).
3. Dodd, J.M., and A.J. Matty: The Thyroid gland. London: Butterworth and Co. (1964).
4. Gustafson, C.G.: PCB's—Prevalent and persistent. Environ. Sci. Technol.4, 814 (1970).
5. Hoar, W.S., and D.J. Randall: Fish physiology. New York: Academic Press (1969).