Agricultural Economics 143 Policy and Planning 47 Agriculture 35 Agricultural policy 34 Farm economics 28 Food Economics, (New March 2000) 25 Economics 22 more ... Natural Resource Economics, (New March 2000) 22 Agricultural development 20 Social Psychology and Social Anthropology, (New March 2000) 20 Economic aspects 18 Laws and Regulations 18 Plant Production 18 International Trade 16 Biotechnology 15 Food security 15 Rural development 15 Agricultural sector 14 International trade 14 Sustainability 14 Agricultural economics 13 Agriculture and state 13 Case studies 13 Economics/Management Science 13 Research 13 Biotechnology (General), (Revised June 2002) 12 Horticultural Economics, (New March 2000) 12 Marketing and Distribution 12 Plant Breeding and Genetics 12 Marketing 11 less ...