United States Geological Survey Bulletin ;
Collier, A J.
United States Geological Survey Bulletin ; no.736-F - Washington-US : United States Geological Survey Bulletin, 1922. - páginas 171-178 : IIustraciones blanco y negro - No. 736-F (1922) - United States Geological Survey Bulletin ; no.736-F . - United States Geological Survey. .
United States Geological Survey Bulletin ; no.736-F - Washington-US : United States Geological Survey Bulletin, 1922. - páginas 171-178 : IIustraciones blanco y negro - No. 736-F (1922) - United States Geological Survey Bulletin ; no.736-F . - United States Geological Survey. .