Robinson, P. T. (1975). Reconnaissance geologic map of the John Day formation in the southwestern part of the Blue Mountains and adjacent areas, north-central Oregon. The Survey.
Chicago Style (17th ed.) CitationRobinson, Paul T. Reconnaissance Geologic Map of the John Day Formation in the Southwestern Part of the Blue Mountains and Adjacent Areas, North-central Oregon. Reston, Va.: The Survey, 1975.
MLA (9th ed.) CitationRobinson, Paul T. Reconnaissance Geologic Map of the John Day Formation in the Southwestern Part of the Blue Mountains and Adjacent Areas, North-central Oregon. The Survey, 1975.
Warning: These citations may not always be 100% accurate.