Sterrett, Douglas B.. <br/><br/>
United States Geological Survey Bulletin ;   no.580-F 

 - Washington-US :   United States Geological Survey Bulletin,   1914. 
 - páginas 1-125 :   IIustraciones blanco y negro 
 - No. 580-F (1914) 
 - United States Geological Survey Bulletin ;   no.580-F .
 - United States Geological Survey. .