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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. REFERENCESBalbus, J., R. Parkin, and M. Embrey. 2000. Susceptibility in microbial risk assessment: Definitions and research needs. Environmental Health Perspectives 108(9):901-905. Mershon, S. and J. Tarr. 2003. Strategies for clean air: The Pittsburgh and Allegheny County smoke control movements, 1940-1960. In Devastation and Renewal: An Environmental History of Pittsburgh and Its Region, J. Tarr (ed.). Pittsburgh, PA: University of Pittsburgh Press. NRC (National Research Council). 2001. Classifying Drinking Water Contaminants for Regulatory Consideration. Washington, DC: National Academy Press. NRC. 2004. Indicators for Waterborne Pathogens. Washington, DC: National Academies Press. WSIP (Southwestern Pennsylvania Water and Sewer Infrastructure Project Steering Committee). 2002. Investing in Clean Water: A Report from the Southwestern Pennsylvania Water and Sewer Infrastructure Project Steering Committee. Pittsburgh, PA: Campaign for Clean Water.
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