The manufacture and utilization of portland cement/ United Nations 

 - Nova York:  United Nations,  1972 
 - 25p. 
<br/><br/> Inv. 2016 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cimento-Portland
<br/><br/><label>Universal Decimal Class. No.: </label>666.94   / UNI ma