Circular 21 - Insecticides and Subsidiary Materials 87 
Murphy, Walter J. — 1939. — Chemical industries- 
Buyers* guide-book number. 
15th Ann. Rev. Vol. 45, #5, 
October. New York. Edited 
by Walter J. Murphy 
Quaintance, A.L. 1931. — Insecticides, equip- 
ment and methods for con- 
trolling orchard insects. 
U. S. D. A. Farmers' Bull. 
1666. 
Schnell Publishing Co. Inc. 
1941. — Oil, Paint and Drug 
Reporter. Vol. 140, #8, 
August 25. Schnell Publ. 
Co., Inc., New York. 
Also all references cited in the series of 
Defense Circulars. 
