1 | The effect of the voluntary initiative on water quality |
2 | The quality of rivers, canals and estuaries in England and Wales : report of the 1990 survey |
3 | Identification of Blue Green Algae of the British Isles Guide to the Genera and Use of the Interactive CD-ROM for Identification of Species |
4 | Remote sensing and baseline monitoring of the coastal waters of England and Wales 1992-1993 : a survey report [external version] |