Biological survey of common land.
Hedley, S.
Aitchison, J. W.
English Nature (Agency)
University College of Wales (Aberystwyth, Wales).Rural Surveys Research Unit.
Peterbourgh : English Nature,
1991.
"Produced under contract by Road Surveys Research Unit"
"A survey of the biological characteristics and management of common land"
Includes bibliographical reference.