Subject
- Semen3
- Artificial insemination2
- Spermatozoa2
- Strains and stresses2
- Wind tunnels2
- Airplanes -- Piloting1
- Bulls1
- Cattle -- Feeding and feeds1
- Dairy cattle -- Feeding and feeds1
- Dairying -- Research1
- Douglas fir1
- Dynamometer1
- Flight1
- Forests and forestry -- Oregon1
- Gages1
- Grazing1
- Milk -- Composition1
- Oregon State College. Aeronautical Laboratory1
- Photoelasticity1
- Private planes1