Fernando, M. C. E. <br/><br/>
Some recent development in the secondary treatment of sewage 

 - University of Toronto  Toronto  1956 
 - 53p.  fig. 
<br/><br/><label>Nat. Bib. No.: </label>7109 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering
<br/><br/><label>Universal Decimal Class. No.: </label>628.33  / FER