Worldwatch paper 

 - Washington, D.C. :  Worldwatch Institute,  1999- 
 - v. :  ill. ;  22 cm. 
 - Irregular 
 - no. 146 (April 1999)- 
<br/><br/> UKM: no. 146 (1999)-  no.152-154, no.155-159, no.146-149, 157-159  (hantar jilid pada 2/5/07) b.17-20 
<br/><br/><label>ISSN: </label>0270-8019 
 = Worldwatch paper 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Human ecology<br/>Conservation of natural resources<br/>Energy conservation<br/>Power resources