Wright, J.F.; Gunn, R.J.M.; Winder, J.M.; Symes, K.L.; Furse, M.T.; Blackburn, J.H.. 1991 Invertebrate survey and classification of rivers for nature conservation 1990/91 report. Institute of Freshwater Ecology, 57pp. (CEH Project no. T04053b1) (Unpublished)
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