The Polish Scouting and Guiding Association in Russian state von R. Stefaniak

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Environmental impact of utilizing coal mining waste forroad construction von Stefaniak, S., Twardowska, I.

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Bryophytes of the experimental and teaching garden of the faculty of biology and environmental protection, university of Lodz (Poland) von Wolski, G.J., Stefaniak, A., Kowalkiewicz, B.

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Bryophytes of the experimental and teaching garden of the faculty of biology and environmental protection, university of Lodz (Poland) von G. J. Wolski, A. Stefaniak, B. Kowalkiewicz

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