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Twardy, S. (2012). Contamination of surface water bodies with biogenic substances, taking into account the impact of agriculture in the Western Carpathians..
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Kopacz, M., & Twardy, S. (2014). Spatial Modeling as a Tool Supporting the Management of Catchment Area of Retention Reservoir..
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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. (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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