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Sampling locations for Blue mussels within the Baltic Proper and off the Swedish West Coast: Askö (ASK), Tvärminne (TVA), Karlskrona (KAR), Gdansk (GDA) and Kristinberg (KRI). At each location three sites representing different pollution types were sampled; reference (REF) sites, sewage treatment plant (STP) effluent affected sites, and sites in the vicinity of harbors (HAR).
