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Frost, MT, Leaper, R, Mieszkowska, N, Murua, J, Smyth, C and Hawkins, SJ 2004 Recovery of a biodiversity action plans species in northwest England: possible role of climate change, artificial habitat and water quality amelioration. Occasional Publication of the Marine Biological Association 16. Plymouth (UK), Marine Biological Association of the United Kingdom. (UNSPECIFIED)