Washburne, Chester W.
Reconnaissance of the Geology and oil Prospects of Northwestern Oregon. - Washington-US : United States Geological Survey Bulletin, 1914. - páginas 3-111 : IIustraciones blanco y negro - No. 590 (1914) - United States Geological Survey Bulletin ; no.590 . - United States Geological Survey. .
Reconnaissance of the Geology and oil Prospects of Northwestern Oregon. - Washington-US : United States Geological Survey Bulletin, 1914. - páginas 3-111 : IIustraciones blanco y negro - No. 590 (1914) - United States Geological Survey Bulletin ; no.590 . - United States Geological Survey. .
