Ray, Bill T. <br/><br/>
Environmental engineering 
Bill T. Ray 
 - New York  PWS Publishing  1995 
 - 496 p. : ill. ; 24 cm. 
<br/><br/><label>ISBN: </label>0534206522  RM206.81 
<br/><br/><label>LCCN: </label>94-26681 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental engineering<br/>Environmental sciences