Spurr, Josiah Edward <br/><br/>
Political and commercial geology and the world's mineral resources. 

 - New York :  McGraw-Hill,  1920. 
 - 562 p. :  il. ;  23 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geología económica<br/>Geología política<br/>Minerales<br/>Recurso minero
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>338.2