River water quality.
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Patrick D. Armitage | Peter Calow | Lorraine Maltby | P. Chave | Brian A. Whitton | P. Calow | B. Whitton | P. Armitage | J. Seager | P. Boon | L. Maltby | A. Hildrew | Alan G. Hildrew | P. Chave | P. Boon | E. Cox | M. Learner | G. Morris | J. Seager | E. Cox | M. Learner | G. Morris