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- Agriculture69,086
- Economic aspects20,596
- Agriculture and state10,063
- History8,905
- United States. Department of Agriculture5,853
- Economic conditions5,554
- Agricultural laborers4,668
- Agricultural credit4,302
- Legislative amendments3,653
- Agriculture, Cooperative2,971
- Law and legislation2,872
- Rural conditions2,792
- Research2,757
- Land tenure2,745
- Agricultural laws and legislation2,513
- Rural development2,183
- Food supply2,172
- Government policy2,145
- Agricultural industries1,914
- Agricultural education1,733