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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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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. (2015). The role of permanent grasslands in mountain areas: Study on agri-environmental importance of permanent grasslands – based on research carried out in the upper Dunajec River basin and Grajcarek Stream basin. Falenty-Krakow.
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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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Twardy, S. (2012). The ecological potential – sustainable development of rural areas in the Carpathians..
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