Chem sources 
/ Directories Publishing Company 
 - New York:   Directories Publishing Company,   1965 
 - 447p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemical technology
<br/><br/><label>Subjects--Index Terms: </label>Chem sources 
<br/><br/><label>Universal Decimal Class. No.: </label>661:338.6/.8  / K4