Hess, Frank L. <br/><br/>
United States Geological Survey Bulletin ;   no.583 

 - Washington-US :   United States Geological Survey Bulletin,   1914. 
 - páginas 7-74 :   IIustraciones blanco y negro 
 - No. 583 (1914) 
 - United States Geological Survey Bulletin ;   no.583 .
 - United States Geological Survey. .