Septic tank systems / 
Public health engineering service; Ontario department of health 
 - Ontario :  Public health engineering service ,  [1961] 
 - 23 p. :  ill. ;  23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Septic Tanks.
<br/><br/><label>Dewey Class. No.: </label>628/.742