Guide to the collection of rocks. 

 - London :  British Museum Natural History,  1933. 
 - 43 p. ;  22 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petrología<br/>Roca
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>552:069.538