Whipple G C <br/><br/>
Microscopy of drinking water 

 - 4 
 -  1948 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>36057 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>E39:2, H8