1. Aber, J. D., Nadelhoffer, K. J., Steudler, P., Mellilo, J. M.: 1989, Bioscience 39, 378?386.
2. Air Resources Board (ARB): 1989, The Health and Welfare Effects of Acid Deposition in California: Technical Assessment, Research Division, 166 pp.
3. Air Resources Board (ARB): 1990, Procedure for the Preparation and Physical Measurements of Wet Deposition Samples, Monitoring and Laboratory Division, 40 pp.
4. Air Resources Board (ARB): 1991a, Amendments to Regulations for the 24-Hour Ambient Air Quality Standard for Sulfur Dioxide, Research Division, 101 pp.
5. Air Resources Board (ARB): 1991b, The Atmospheric Acidity Protection Program: Annual Report to the Governor and the Legislature, 1990. Research Division, 93 pp.