British standard specification for portland cements / 
British Standard Institution 
 - London :  British Standards Institution,  1989 
 - 6 pages :  ill. ;  30 cm. 
 - British standard ;  BS 12 : 1989 .
 - British standard ;  BS 12 : 1989 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Portland cement--Standard<br/>Concrete--Standard