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6901Herbarium Image: Carex aquatilis
6902Herbarium Image: Persicaria amphibia
6903Herbarium Image: Persicaria amphibia
6904Herbarium Image: Persicaria hydropiper
6905Herbarium Image: Eleocharis palustris
6906Herbarium Image: Persicaria amphibia
6907Herbarium Image: Schoenoplectus lacustris
6908Herbarium Image: Schoenoplectus tabernaemontani
6909Best Management Practices to Reduce Diffuse Pollution from Agriculture
6910A report on the use of pesticides at two Hampshire watercress farms
6911Impact Of Conifer Harvesting And Replanting On Upland Water Quality
6912Porth, Gluvian and Menalhyl catchment river water quality classification 1990
6913River Cober catchment river water quality classification 1991
6914River Fal catchment river water quality classification 1990
6915Fact sheet for the RBCA tool kit for chemical releases
6916River Fal catchment river water quality classification 1991
6917River Par and Crinnis catchment river water quality classification 1990
6918River Par and Crinnis catchment river water quality classification 1991
6919St Austell River and south Cornwall coastal streams catchment river water quality classification 1990
6920A draft code of practice for analytical quality control in National Rivers Authority laboratories
6921Control samples for ph determination in low ionic strength waters
6922Proposals to introduce operator monitoring assessment for emissions to air from processes regulated under integrated pollution control : consultation paper
6923Cryptosporidium in drinking water : survey of occurrence. June 1991
6924River Cober catchment river water quality classification 1990
6925Developing Quality Assurance for Fish Counter Data - Phase 1: An Assessment of the Salmonid Fish Counter Network in England and Wales