Noble, L F. <br/><br/>
United States Geological Survey Bulletin ;   no.549 

 - Washington-US :   United States Geological Survey Bulletin,   1914. 
 - páginas 7-97 :   IIustraciones blanco y negro 
 - No. 549 (1914) 
 - United States Geological Survey Bulletin ;   no.549 .
 - United States Geological Survey. .