I thank Dr. Kent Tyler, University of California, on whose plots these tests were conducted; Dow Chemical, USA, Fresno and E. I. duPont de Nemours & Co., Wilmington, DE, for the films; Wilbur-Ellis Co., Fresno for the whitewash materials; the National Weather Service Office, Fresno for the radiation data; W. R. Ellis, U. S. Dept. Agriculture, Fresno for determining the transmission spectra of the films; and Dr. R. M. Klein, University of Vermont and Drs. D. T. Krizek and J. Bennett, U. S. Dept. of Agriculture, Beltsville, MD, for exceptionally helpful suggestions.
Names of commercial products are used for identification and do not constitute an endorsement by the U. S. Dept. of Agriculture.