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Subject
- Agricultural economics24
- Agricultural production15
- Agricultural research14
- United States. Department of Agriculture13
- Yearbook of the United States Department of Agriculture13
- Foreign trade11
- Livestock11
- Agriculture9
- Fruit9
- Agricultural pests8
- Animal diseases8
- Farm management8
- Forests8
- Exports7
- Forest management7
- Plants (Botany)7
- Seeds7
- Agricultural industries6
- Crops6
- Farmers6