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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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Kowalczyk, A., & Kuźniar, A. (2012). The threats of water erosion in the Grajcarek river basin. Pol. J. Environ. Stud., 21(5a), 217–221.
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