Book reviews: Haslam,S.M. 1990: River pollution: an ecological perspective. London: Belhaven Press. xiv+254 pp. £47.00 cloth. ISBN: 1 85293 073 X

Haslam, S.M. 1987: River plants of western Europe. Cambridge : Cambridge University Press.

Hellawell, J.M. 1986: Biological indicators of freshwater pollution and environmental management. London: Elsevier Applied Science Publishers.

Hynes, H.B.M. 1960: The biology of polluted waters. Liverpool : Liverpool University Press.

Moss, B. 1988: Ecology of fresh waters, second edition. Oxford: Blackwell Scientific Publishers.