Agriculture and state Agriculture 187 Economic aspects 164 History 30 Government policy 24 Land tenure 23 Economic policy 22 Food supply 21 Produce trade 21 Rural conditions 21 Congresses 14 Land reform 13 Politics and government 13 Economic conditions 12 Rural development 12 Case studies 10 Research 10 Industrial policy 9 Agricultural prices 8 Commercial policy 8 Commerce 7 Agricultural industries 6 Agricultural laborers 6 Agriculture, Cooperative 6 Periodicals 6 Agricultural innovations 5 Agricultural price supports 5 Agricultural education 4 Food industry and trade 4 Grain 4