Dawson, F.H.; Newman, J.R.; Gravelle, M.J.. 1996 Mean Trophic Rank Macrophyte Survey. An assessment of the trophic status of rivers using macrophytes. R&D Interim Report 694/NW/01. Environment Agency, 29pp. (Environment Agency R&D: 694/NW/01, TFS Project no. T04073q7) (Unpublished)
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