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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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Twardy, S. (2013). The usefulness of the research results conducted on the permanent grasslands for carrying out the pro-environmental management in mountain areas..
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Twardy, S., & Kopacz, M. (2014). Sustainable use of mountain lands as a basis of permanent quality maintaining of natural environment. Falenty-Krakow.
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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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Kowalczyk, A., & Twardy, S. (2012). Comparison of the water erosion magnitude estimated by the modified USLE methods (Vol. 121).
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