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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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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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