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Work cat.: (OSt)237218: Wünstel, Andreas 152294, Further Data on the Biology of the River Lamprey Lampetra Fluviatilis in an Anthropogenously Altered River in Northrhine Westphalia = Weitere Daten Zur Biologie Des Fluáneunauges Lampetra Fluviatilis in Einem Anthropogen Überformten Fluá Nordrhein Westfalens