Masonry mortars 
/ National Buildings Organisation  
 -  National Buildings Organisation,  
 - 16p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Building trade
<br/><br/><label>Subjects--Index Terms: </label>Masonry  
<br/><br/><label>Universal Decimal Class. No.: </label>69(549)691.53