WeBS alerts 1999/2000 : changes in numbers of wintering waterbirds in the United Kingdom at national, country and SSSI scales : interim report /
Atkinson, Philip W.
Rehfisch, M.
Pollitt, Mark.
British Trust for Ornithology.
Thetford : British Trust for Ornithology,
2012.
"May 2001 (recompiled February 2011)".
Includes bibliographical references.
Waterbirds
Bird populations