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Reconnaissance geologic map of the John Day formation in the southwestern part of the Blue Mountains and adjacent areas, north-central Oregon
John Day formation, north-central Oregon
1 map : color ; on sheet 87 x 112 cm., folded in envelope 30 x 24 cm.
by Paul T. Robinson ; Department of the Interior, United States Geological Survey.
"Contour interval 200 feet with supplementary contours at 100-foot intervals."
Includes "Index to sources used in preparing present map," 3 col. cross sections, and location map.
Miscellaneous investigations series (Geological Survey (U.S.)) ; Map I-872