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Kopacz, M., & Twardy, S. (2014). Spatial modeling as a tool supporting the management of catchment area of retention reservoir. Pol. J. Environ. Stud., 23(3a), 53–57.
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Kopacz, M., & Twardy, S. (2012). A spatial analysis of biogenic load differentiation of an agricultural origin in the Carpathian basin. Pol. J. Environ. Stud., 21(5a), 196–200.
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