1. R. A. BAETZ, J. Assoc. Offic. Agr. Chemists 47, 322 (1964).
2. H. P. BURCHFIELD and D. E. JOHNSON. (1965). Guide to the analysis of pesticide residues, Vol. 1. Public Health Service Bureau of State Services (Environmental Health) Office of Pesticides, Washington, D. C. Available from U. S. Govt. Printing Office, Washington, D. C.
3. M. EIDELMAN, Assoc. Offic. Agr. Chemists 45, 672 (1962).
4. H. P. EIDUSON, Ibid., 44, 183 (1961).
5. R. P. FARROW, E. R. ELKINS, JR., and L. M., BEACHEM, III, Ibid., 48, 738 (1965).