Present needs for research on the use and care of natural resources 

 - Washington :  NAS,  1953 
 - 35 p. 
 - NAS. Publication  ; 288 .
 - NAS. Publication  ; 288 .
<br/><br/><label>LCCN: </label>30206 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Recursos naturales--Conservación.