Key indicators for British wildlife : the red squirrel & grey squirrel in Crown forests /
Banwell, T. J.
Crawford, T. J.
Usher, Michael B.,1941-
Great Britain.Department of the Environment.
York : Institute for Applied Biology, University of York,
1991.
Report to the Department of the Environment (Ref. PECD 7/2/84)
Includes bibliographical references.