Baltic Sea harbour porpoise populations: status and conservation needs derived from recent survey results by Benke, Harald, Brager, Stefan, Dahne, Michael, Gallus, Anja, Hansen, Sophie, Honnef, Christopher G, Jabbusch, Martin, Koblitzl, Jens C, Kriige, Kathrin, Liebschner, Alexander, Narberhaus, Ingo, Verfuss, Ursula K

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