Subject
- Forest roads -- Design and construction4
- Forest roads -- Oregon -- Design and construction2
- Hydroelectric power plants -- Oregon -- Design and construction2
- Sawmills -- Design and construction2
- Automobiles -- Motors -- Design and construction1
- Bridges, Truss -- Design and construction1
- Electric generators1
- Electric generators -- Alternating current -- Design and construction1
- Electric generators -- Direct current -- Design and construction1
- Electric light plants -- Design and construction1
- Electric motors -- Design and construction1
- Electric power transmission -- Oregon1
- Electric transformers -- Design and construction1
- Farmhouses -- Lighting1
- Flywheels -- Design and construction1
- Forest management1
- Hydroelectric power plants -- Oregon -- Minam River -- Design and construction1
- Internal combustion engines -- Mufflers -- Design and construction1
- Kilns -- Design and construction1
- Log transportation1