River pollution survey England and Wales 1975
Subtitle: chemical classification of rivers for the South West Water Authority
By: Department of the Environment, Water Data Unit.
Contributors: Great Britain. Water Data Unit.; South West Water Authority.
Edition: Scale 1:250,000.
Series: SWWA -- 09
Publisher: Department of the Environment, Water Data Unit
Published: 1976
Place of publication: Reading
Language: eng
Notes: "Based upon the Ordnance Survey map...".