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.
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Chicago-čujuhus (17. p.)
National Research Council (U.S.). Committee on Water Quality Improvement for the Pittsburgh Region juo Inc ebrary. Regional Cooperation for Water Quality Improvement in Southwestern Pennsylvania. Washington, DC: National Academies Press, 2005.
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MLA-čujuhus (9. p.)
National Research Council (U.S.). Committee on Water Quality Improvement for the Pittsburgh Region juo Inc ebrary. Regional Cooperation for Water Quality Improvement in Southwestern Pennsylvania. National Academies Press, 2005.
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