The manufacture of cement and sulphuric acid from calcium sulphate/ United Nations 

 - Nova York:  United Nations,  1971 
 - 86p.  :il. 
<br/><br/> Inv. 2016 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cimento<br/>Acido sulfurico<br/>Sulfato de cálcio
<br/><br/><label>Universal Decimal Class. No.: </label>666.94   / UNI ma