1. CASEBEER, R. L., Monitoring the 1964 Spruce Budworm Aerial Spray Project. U. S. Forest Service Publication. U. S. D. A., Ogden, Utah (1965).
2. U. S. D. A. Agricultural Research Service mimeographed report PCY-65-16 (on file with Entomology Research Division, Agricultural Research Service, Yakima, Washington) (1965).
3. de FAUBERT MAUNDER, M. J., EGAN, H., GODLY, E. W., HAMMOND, E. W., ROBURN, J. and THOMSON, J., Analyst 89: 168–174 (1964).
4. MILLS, P. A., J. Assoc. Offic. Agr. Chemists 44:2, 171–177 (1961).
5. MILLS, P. A., ONLEY, J. H. and GAITHER, R. A., J. Assoc. Offic. Agr. Chemists 46:2, 186–191 (1963).