US Geological Survey annual report 

 - WASHINGTON, d.c. :  US GEOLOGICAL SURVEY, 
 - Anual 
<br/><br/><label>ISSN: </label>0147-8478 
 = US Geological Survey annual report 
 = US GEOL. SURV. ANNU. REP. 
<br/><br/><label>Subjects--Index Terms: </label>GEOLOGIA