76 | Report on US study tour of engineered wetlands for the treatment of waste water and mine drainage, March 1992 |
77 | An investigation into possible causes of poor water quality at Nymphayes Bridge (R30D009) on the Gissage Lake |
78 | Environmental Impacts of Alkylphenol Ethoxylates and Carboxylates. Part 1 Proposals for the Development of Environmental Quality Standards |
79 | An investigation into the presence of high levels of cadmium in sea-water samples from Mounts Bay, Cornwall |