Subject
- Mineral industries -- Oregon9
- Natural gas -- Prospecting -- Oregon9
- Petroleum -- Prospecting -- Oregon9
- Geology -- Oregon -- Field work4
- Geothermal resources -- Oregon4
- Metallurgy -- Oregon3
- Beach erosion -- Oregon2
- Faults (Geology) -- Oregon -- Tualatin Mountains2
- Geology -- Oregon -- Tualatin Mountains2
- Metallurgical plants -- Oregon2
- Trees, Fossil -- Oregon -- Crook County2
- Acacia -- Oregon -- Crook County1
- Aggregates (Building materials) -- Oregon1
- Aluminum mines and mining -- Oregon -- Columbia County1
- Asbestos -- Oregon1
- Asbestos mines and mining -- Oregon1
- Astoria (Or.)1
- Astoria (Or.) -- History1
- Automobiles -- Scrapping1
- Beach erosion -- Oregon -- Alsea Bay1