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1 Pesticides Research Laboratory, National Communicable Disease Center, Bureau of Disease Prevention and Environmental Control, Public Health Service, U. S. Department of Health, Education and Welfare, 33157, Perrine, Florida.
1 Pesticides Research Laboratory, National Communicable Disease Center, Bureau of Disease Prevention and Environmental Control, Public Health Service, U. S. Department of Health, Education and Welfare, 33157, Perrine, Florida.