Ledden, Debbie van <br/><br/>
Waterbird count site delimitation: preliminary guidlines for Co-ordinators of the International Waterbirds Census/ 
Debbie van Ledden  
 - Revised version. 
<br/><br/> A graduation project on waterbird count site delimitation. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Birds<br/>Water birds -- Conservation<br/>Wetland ecology
<br/><br/><label>Dewey Class. No.: </label>KUŞ 598.2924  / LE.W