Population changes of certain opportunistic bird species in the United Kingdom between 1985 and 1994 /
Marchant, John,1951-
Gregory, Richard D.
British Trust for Ornithology.
Thetford : British Trust for Ornithology,
2006.
"First report to the Department of the Environment to comply with 6.1 of contract CR0151."
"March 1995."
Includes bibliographical references.
Bird populations