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32. 6. L. Ter Haar, D. Lenane, J. Hu, and M. Brandt, "Composition, Size, and Control of Automobile Exhaust Particulates," presented at 1971 Technical Session of the Central States .Section of The Combustion Institute, Ann Arbor, Michigan, March 1971; same authors, "Composition, Size and Control of Automotive Exhaust Particulates," presented at 64th Annual Meeting of the Air Pollution Control Association, Atlantic City, N. J., June-July 1971. 33* R- E. Sampson and G. S. Springer, "Particulate Formation in Spark Ignition Engine Exhaust," presented at same meeting as preceding reference. 34. G. L. Ter Haar and Ruth E. Stephens,"The Effects of Automobile Exhaust Particulates on Visibility," presented at the 12th Conference on Methods in Air Pollution and Industrial Hygiene Studies, University of Southern California, Los Angeles, April -6-8 1971. 35. J. M. Pierrard and R. A. Crane, "The Effect of Gasoline Compositional Changes on Atmospheric Visibility and Soiling," presented at the 64th Air Pollution Control Association Meeting, Atlantic City, June 1971; same authors, "Auto Exhaust -- lead vs aromatics," Hydrocarbon Processing 50, 142 (1971). 36. R. E. Lee, Jr., R. K. Patterson, W. L. Crider, and J. Wagman, "Concentration and Particle Size Distribution of Particulate Emissions in Automobile Exhaust," Atmospheric Environment 5, 225 (1971). 37. J. Wagman, "Aerosol Composition.and Component Size Distri butions in Urban Atmospheres," presented at the 11th Confer ence on Methods in Air Pollution and Industrial Hygiene Studies, Berkeley, California, April 1970. 38. R. H. Herling, W. E. Karches, J. Wagman, 0. J. Manary, and J. B. Moran, "A Comparison of Automotive Particle Mass Emissions Measurement Techniques," presented at same meeting as Reference 32. 39. D. Olsen and J. L. Haynes, National Air Pollution Control Administration Publication No. APTD 69-43, Preliminary Air Pollution Survey of Organic Carcinogens (U.S.Dept. of Health, Education, and Welfare, 1999) 40. W. J. Frey and M. Corn, "Diesel Exhaust Particulates," Nature 216, 615 (1967). 1' 16 ffOOO 0630 ./ PROnnrpn tv cncn