Subject
- Agricultural wastes as fuel1
- Algae products1
- Clay -- Permeability1
- Clay minerals -- Oregon1
- Clay soils1
- Clay soils -- Oregon1
- Dairy cattle -- Manure -- Recycling1
- Nitrogen fertilizers1
- Nitrogen-fixing algae as fertilizer1
- Soil chemistry -- Oregon1
- Soil erosion -- Oregon1
- Soil formation -- Oregon1
- Stream channelization -- Northwest, Pacific1
- Stream ecology -- Northwest, Pacific1