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Hydrotechnic structures on the Pomeranian rivers - a reaction to extreme hydrologic phenomena in the 19th century (in the example of the upper Wieprza)Geographia Polonica Vol. 83 No. 1 (2010)Hydrotechnic structures on the Pomeranian rivers - a reaction to extreme hydrologic phenomena in the 19th century (in the example of the upper Wieprza)Geographia Polonica Vol. 83 No. 1 (2010)

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