Natural Resources (General) Natural Resource Economics, (New March 2000) 10 Natural resources 8 Agricultural Economics 7 Resource management 7 Agriculture 5 Agricultural development 4 Case studies 4 Research 4 Social Psychology and Social Anthropology, (New March 2000) 4 Sustainability 4 Agricultural research 3 CGIAR 3 Economic impact 3 Environmental impact 3 Indicators 3 Leisure, Recreation and Tourism Economics, (New March 2000) 3 Methodology 3 Policy and Planning 3 Sustainable development 3 Techniques and Methodology 3 Tourism and Travel 3 Agricultural policy 2 Agriculture (General) 2 Assessment 2 Conflict 2 Conflict, (New March 2000) 2 Ecotourism 2 Environmental management 2 Environmental policy 2