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2. Federal Register. Occupational Safety and Health Standards (Chapter 17, part 1910)38 (83) 10715 (1973).
3. Gunther, F. A., W. E. Westlake, J. H. Barkley, W. Winterlin, and L. Langbehn: Establishing dislodgeable pesticide residues on leaf surfaces. Bull. Environ. Contam. Toxicol.9, 243 (1973).
4. McNair, H. M., and E. J. Bonelli: Basic Gas Chromatography, Varian Aerograph, Walnut Creek, California pp. 150, 151 (1969).
5. Milby, T. H., F. Ottoboni, and H. W. Mitchell: Parathion residue poisoning among orchard workers. J. Am. Med. Soc.189, 351 (1964).