Spurr, Josiah Edward,  1870-1950. <br/><br/>
Geology of the Aspen mining district, Colorado, with atlas. 

 - Washington,  Govt. print. off.,  1898. 
 - 260 p. 
<br/><br/><label>LCCN: </label>gs 05000816  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Colorado.<br/>Silver mines and mining--Colorado.
<br/><br/><label>LC Class. No.: </label>QE75  / .M7 vol. 31 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.9:31