Subject
- Geology -- Oregon28
- Geology -- Oregon -- Clatsop County15
- Geology, Stratigraphic15
- Geology, Stratigraphic -- Miocene9
- Geology -- Oregon -- Field work6
- Geology -- Oregon -- Jefferson County6
- Geology, Stratigraphic -- Eocene6
- Geology, Stratigraphic -- Tertiary6
- Geology -- Oregon -- Dayville Quadrangle5
- Geothermal resources -- Oregon5
- Mineral industries -- Oregon5
- Natural gas -- Prospecting -- Oregon5
- Petroleum -- Prospecting -- Oregon5
- Astoria (Or.)4
- Faults (Geology) -- Oregon4
- Geology -- Oregon -- Crook County4
- Geology -- Oregon -- Harney County4
- Geology -- Oregon -- Mitchell Quadrangle4
- Geology -- Oregon -- Wheeler County4
- Geology, Stratigraphic -- Oligocene4