Concrete manual  
/ U. S. Department of the Interior  
 - 6th ed.  
 - Washington:   Government Printing Office,   1956 
 - xxvi, 491p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemical technology 
<br/><br/><label>Subjects--Index Terms: </label>Watertightness  
<br/><br/><label>Universal Decimal Class. No.: </label>666.97(021)   / J6