Clawr = Cover: English Nature, Cyngor Cefn Gwlad Cymru, Countryside Council for Wales.
Cytundebwr ymchwil = Research contractor: School of Geography and Environmental Science, The University of Birmingham.
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Invertebrates of exposed riverine sediments : phase 2 by J. P. Sadler. ISBN 1857051998. Published by Environment Agency in 2000. Publication and catalogue information, links to buy online and reader comments.
