Ekblaw, George E. <br/><br/>
Typical rocks and minerals in Illinois. 

 - Illinois :  State Geological Survey,  1936. 
 - 79 p. :  il. ;  19 cm 
 - Educational Series  3 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mineralogía<br/>Minerales<br/>Roca
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Illinois
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>549:552(773)