Frank J. Welcher <br/><br/>
Standard methods of chemical analysis. 
Frank J. Welcher 
 - Ed 6 
 -  D Van Nostrand  1963 
<br/><br/><label>ISBN: </label> 190.8 
<br/><br/><label>Dewey Class. No.: </label>543WEL.K3.2-2