Numbers and distribution of waterbirds in the Wadden Sea :  result and evaluation of 36 simultaneous counts in the Dutch-German-Danish Wadden Sea 1980-1991 / 
Hans Meltofte ... [et al.] 
 - Denmark :  Common Secretariat for the Cooperation on the Protection Wadden Sea,  1994 
 - 192 p. :  ill. ;  30 cm. 
 - IWRB publication ;  no. 34 .
<br/><br/><label>ISBN: </label>0950573175  Hadiah 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water birds--Netherlands--Waddenzee<br/>Bird populations--Netherlands--Waddenzee