Measurements of ultraviolet radiation and illumination in American cities during the years 1931 to 1933 / by James E. Ives, senior physicist and W.A. Gill, assistant chemical engineer, Office of Industrial Hygiene and Sanitation, U.S. Public Health Service ; prepared by direction of the Surgeon General.
Imprint
Washington, D.C. : United States Government Printing Office, 1937.