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Work cat.: (OSt)237205: Wünstel, Andreas 152294, Ground Substrate and Choice of Spawning Sites of the River Lamprey Lampetra Fluviatilis in an Anthropogenously Altered River in Northrhine Westphalia = Sohlsubstrat Und Laichplatzwahl Des Fluáneunauges Lampetra Fluviatilis in Einem Anthropogen Überformten Fluá Nordrhein-Westfalens