Subject
- Natural resources -- Oregon2
- Agricultural landscape management1
- Agriculture -- Economic aspects -- Oregon -- Linn County1
- Agriculture -- Klamath River Watershed (Or. and Calif.)1
- Alaska -- Description and travel1
- Columbia River1
- Express highways -- Economic aspects1
- Express highways -- Oregon -- Linn County1
- Farms -- Oregon -- Linn County1
- Forests and forestry -- Oregon -- Sweet Home Area1
- Fruit-culture -- Oregon -- Jackson County1
- Groundwater -- Nebraska1
- Hood River County (Or.)1
- Industries -- Oregon -- Sweet Home1
- Irrigation -- Nebraska -- Hamilton County1
- Irrigation farming -- Nebraska1
- Klamath River Region (Or. and Calif.) -- Economic conditions1
- Land use -- Oregon1
- Mines and mineral resources -- Alaska1
- Natural resources -- Alaska1