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Tyler-Walters, H; Marshall, CM; Hiscock, K; Hill, JM; Budd, GC; Rayment, WJ; Jackson, A. 2005 Description, temporal variation, sensitivity and monitoring of important marine biotopes in Wales. Plymouth, Marine Biological Association of the UK, 91pp. (Volume 1 Background, Volume 2 Littoral biotopes, Volume 3 Infralittoral biotopes)