Mattern, Thomas, <br/><br/>
Humboldt penguin census on isla Chañaral, Chile :  : recent increase or past underestimate of penguin numbers? / 
Thomas Mattern ...[and others]. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CENSOS.<br/>CONSERVACION.<br/>PINGÜINO DE HUMBOLDT.<br/>SPHENISCUS HUMBOLDTI.