Bird census techniques /
Bibby, Colin J.
Burgess, Neil D.
Hill, David A.
British Trust for Ornithology.
Royal Society for the Protection of Birds.
London : Academic Press,
c1992.
"Published for the British Trust for Ornithology and the Royal Society for the Protection of Birds."
Includes bibliographical references (p. 241-251) and indexes.
Birds
Bird populations