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Protecting Visibility in National Parks and Wilderness Areas References ACGIH (American Conference of Governmental Industrial Hygienists). 1989. Air Sampling Instruments for Evaluation of Atmospheric Contaminants, 7th ed., S.V. Hering, ed. American Conference of Governmental Industrial Hygienists, Cincinnati, Ohio. ACSPCT (Arizona Copper Smelter Pollution Control Technology). 1977. First Annual Report on Arizona Copper Smelter Pollution Control Technology, Arizona Department of Health Services, Phoenix, Ariz. April. Adams, K.M. 1988. Real-time, in situ measurements of atmospheric optical absorption in the visible via photoacoustic spectroscopy. I. Evaluation of photoacoustic cells. Appl. Opt. 27:4052–4056. Adams, K.M., L.I. Davis, Jr., S.M. Japar, and D.R. Finley. 1990. Real-time, in situ measurements of atmospheric optical absorption in the visible via photoacoustic spectroscopy. IV. Visibility degradation and aerosol optical properties in Los Angeles. Atmos. Environ. 24A:605–610. Aden, G.D., and P.R. Buseck. 1983. A minicomputer procedure for quantitative EDS (energy-dispersive spectrometer) analyses of small particles. Pp. 195–201 in Microbeam Analysis-1983, R. Gooley, ed. San Francisco, Calif.: San Francisco Press, Inc. Air Resources Specialists, Inc. 1988. Visibility Monitoring and Data Analysis Report for Spring 1986 Through Winter 1988 Monitoring Seasons, Vol. 2, Appendix A, Seasonal Summary Reports. NPS Contract #CX-0001-07-0010. Prepared for the National Park Service, Air Quality Division, Fort Collins, Colo. June.

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