Wright, J.F.; Gunn, R.J.M.; Symes, K.L.; Matthews, J.M.; Furse, M.T.; Blackburn, J.H.; Winder, J.M.. 1992 Invertebrate survey and classification of rivers for nature conservation 1991/92 report. Institute of Freshwater Ecology, 58pp. (CEH Project no. T04053b1) (Unpublished)
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