Third European Seminar for Sanitory engineers, 27 October-1 November, 1952, London <br/><br/>
Design and operation of septic tanks: third European seminar for sanitary engineers  World Health Organization, Geneva. 

 - Geneva  World Health Organization  1953 
 - 122p. 24cm. 
<br/><br/><label>Dewey Class. No.: </label>628.742  / E81D