Harrison, R. K. <br/><br/>
A petrological mineralogical code for computer use 
R. K. Harrison 
 - London :  Her Majesty's Office,   1970 
 - viii,134p.  ill.   30cm.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and minerals
<br/><br/><label>LC Class. No.: </label>QTOQE431.5.H37