National Research Council (U.S.). Committee on Water Quality Improvement for the Pittsburgh Region & ebrary, Inc. (2005). Regional cooperation for water quality improvement in southwestern Pennsylvania. National Academies Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Research Council (U.S.). Committee on Water Quality Improvement for the Pittsburgh Region और Inc ebrary. Regional Cooperation for Water Quality Improvement in Southwestern Pennsylvania. Washington, DC: National Academies Press, 2005.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Research Council (U.S.). Committee on Water Quality Improvement for the Pittsburgh Region और Inc ebrary. Regional Cooperation for Water Quality Improvement in Southwestern Pennsylvania. National Academies Press, 2005.
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