1. Leighton, P. A., Photochemistry of Air Pollution (Academic Press, New York, 1961).
2. Junge, C. E., Air Chemistry and Radioactivity (Academic Press, New York, 1963).
3. Reiter, E. R., Atmospheric Transport Processes, Part 2, Chemical Tracers (US Atomic Energy Commission, 1971).
4. US Department of Health, Education and Welfare, Air Quality Criteria for Photochemical Oxidants (Washington: Publication No. AP-63, March 1970).
5. US Air Resources Board, Recommended Air Quality Standards (September 1970).