Subject
- Algae2
- Algae -- Cultures and culture media1
- Botanists -- Oregon1
- Botany -- Oregon -- Bibliography1
- Douglas fir -- Diseases and pests1
- Freshwater algae1
- Growth (Plants)1
- Hops -- Diseases and pests1
- Onions -- Diseases and pests1
- Plant collectors -- Oregon1
- Potatoes1
- Pyrenochaeta terrestris1
- Root rots1
- Streptomycin1