1. CASIDA, J. E., and D. M. SODERLUND: ACS Symp. Ser.No. 42, 173 (1977).
2. CHAPMAN, R. A., and H. S. SIMMONS: J. Assoc. Offic. Anal. Chem.60, 977 (1977).
3. CHAPMAN, R. A., and C. R. HARRIS: J. Chromatogr.166, 513 (1978).
4. CHAPMAN, R. A., and C. R. HARRIS: J. Chromatogr.174, 369 (1979).
5. CHAPMAN, R. A., and C. R. HARRIS: J. Environ. Sci. and Health. In press.