The Geologic setting of the John Day country
Subtitle: Grant County, Oregon.
Contributors: Thayer, Thomas Prence, 1907-; Geological Survey (U.S.)
Publisher: U.S. Dept. of the Interior, Geological Survey
Published: 1969
Place of publication: [S.l.]
Subjects: Recreation areas -- Oregon -- Grant County.; Geology -- Oregon -- Grant County.
Other titles: John Day County.