Environmental problems  textbook series for diploma of associate engineer 

 - Islamabad :  National Book Foundation 
 - 89p. 
<br/><br/><br/>Eng. 
<br/><br/> pbk 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental problems
<br/><br/><label>Dewey Class. No.: </label>3636.7 ENV 2002 14533