River quality 1990 : according to the new general quality assessment (GQA) scheme [peta]

Míreanna comhchosúla

• The quality of rivers and canals in England and Wales (1990 to 1992) : as assessed by a new general quality assessment scheme : report of the National Rivers Authority, May 1994
  de réir: Great Britain. National Rivers Authority
  Foilsithe / Cruthaithe: (1994)
• Abandoned mines and the water environment : report of the National Rivers Authority, March 1994
  de réir: Great Britain. National Rivers Authority
  Foilsithe / Cruthaithe: (1994)
• The Mersey Estuary : a report on environmental quality
  de réir: Great Britain. National Rivers Authority
  Foilsithe / Cruthaithe: (1995)
• Discharge consents and compliance : the NRA's approach to control of discharges to water /
  de réir: National Rivers Authority (Great Britain)
  Foilsithe / Cruthaithe: (1994)
• River water quality stations in Peninsular Malaysia 1975- / [peta]
  de réir: Malaysia. Bahagian Parit dan Taliair
  Foilsithe / Cruthaithe: (1975)