Birds of the Lower Derwent Valley : a historical review 1850-2002 /
Ralston, Craig S.
English Nature (Agency)
Great Britain.Environment Agency.
Yorkshire Naturalists' Union.
Yorkshire Wildlife Trust.
Carstairs Countryside Trust.
British Waterways.
Pocklington Canal Amenity Society.
York : North & East Yorkshire Team, English Nature,
c2005.
Includes bibliographical references.