Surveying orang-utan populations by counting nests from a helicopter :  a pilot survey in Sabah. 

 - Kuala Lumpur :  World Wildlife Fund Malaysia,  1986. 
 - 26 p. :  maps ;  29 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Monkeys--Surveys.--Sabah