Bird cencus techniques / 
[edited by] Colin J. Bibby, Neil D. Burgess and David A. Hill 
 - London :  Academic Press,  1992 
 - 257 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0120958309  Hadiah 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bird populations<br/>Birds<br/>Census