1. Bertuzzi, P. F., L. Kamps, and C. I. Miles: Extraction of chlorinated pesticide residues from nonfatty samples of low moisture content. J. Ass. Offic. Anal. Chemists.50, 623(1967).
2. Caro, J. H.: Comparison of four extraction procedures for root-translocated dieldrin in maize, kale, alfalfa, and wheat. J. Ass. Offic. Anal. Chemists54, 1113(1971).
3. Edwards, R.: The polychlorobiphenyls, their occurrence and significance: A review. Chem. & Ind. (London)47, 1340(1971).
4. Fishbein, L.: Chromatographic and biological aspects of polychlorinated biphenyls. J. Chromatog.68, 345(1972).
5. Fox, C. J. S., D. Chisholm, and D. K. R. Stewart: Effects of consecutive treatments of aldrin of heptachlor on residues in rutabagas and carrots and on certain soil arthropods and yield. Can. J. Plant Sci.44, 149(1964).