1. Macroinvertebrates and the bioassay of water quality; A report based on a survey of the River Lea;Bryce,1978
2. Radioactive fallout in air and rain; Results to end of 1981;Cambray,1982
3. Radioactivity in water from the River Lea;Day;Environ. Pollut. Ser. B,1983
4. 1 Sheet 239 (DRIFT);Geological Survey of England and Wales,1962
5. 1 Sheet 256 (DRIFT);Geological Survey of Great Britain (England and Wales),1964