76 | Analysis of natural and polluted river communities in Great Britain- Progress report for the period January-December 1987 |
77 | Low flows and water resources : facts on the top 40 low flow rivers in England and Wales |
78 | Sea trout gene banks : the feasibility of developing and utilising gene banks for sea trout (salmo trutta) conservation |
79 | Water wise : are you pouring money down the drain? (Bilingual) : Doeth a dwr : ydych chi'n tywallt arian i lawr y draen? |
80 | The Wandle, Beverley Brook, Hogsmill catchment management plan : report on formal consultation response to : response to Wandle/Beverley/Hogsmill CMP catchment management report November 1994 |