Geologic map of Oregon east of the 121st meridian

Walker, George Walton, 1921-

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  • Relief shown by spot heights.
  • "Geology mapped in 1959-73."
  • Includes 3 ancillary maps and text.
  • Ancillary maps: Tectonic map -- Index map of Oregon East of the 121st Meridian showing sources of geologic data -- Geomorphic division of Oregon.
  • Geologic time table on ancillary sheet.
  • Includes bibliographical references.
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