River pollution survey England and Wales 1975
Subtitle: chemical classification of rivers for the Welsh National Water Development Authority
By: Department of the Environment, Water Data Unit.
Contributors: Great Britain. Water Data unit.; Welsh National Water Development Authority.
Series: WNWDA -- 10
Publisher: Department of the Environment, Water Data Unit
Published: 1976
Place of publication: Reading
Language: eng
Notes: "Based upon the Ordnance Survey map...".