Ridker Ronald G Ed. <br/><br/>
Changing resource problem of the fourthworld 
Ridker Ronald G Ed. 
 - Washington  Resources for the future         1976 
 - 157p  cm. 
 - Resources for the Future Publication .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>X:27.1(X).N7, L6