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Kopacz, M., & Twardy, S. The importance of extensive meadow and pasture kind of land use for the implementation of cross-compliance in mountain areas.
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Kopacz, M., & Twardy, S. (2012). Water and sewage management in the upper Dunajec river basin compared to the socio-structural transformations and surface water quality (Vol. 123).
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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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Kopacz, M., & Twardy, S. (2013). Analysis of changes of permanent grasslands in the Carpathians based on the example of upper Dunajec and Raba river catchments (Vol. 133).
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Twardy, S., & Kopacz, M. (2014). Comparison of Concentrations and Loads of Macronutrients Brought with Precipitation and Leaching from the Soil Profile..
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