Szukana fraza: [Bibliografia = %22Czapiewska G.%2C 2015%2C Renewable energy sources in the context of sustainable development of Northern Poland rural areas%2C %5C%5Bw%5C:%5C%5D Energy and Clean Technologies%2C Conference proceedings%2C 15th International Multidisciplinary Scientific GeoConference SGEM%2C Albena%2C Bulgaria%2C s. 447%5C-454.%22]

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