Natural Resources (General) 16 Natural Resource Economics, (New March 2000) 12 Natural resources 9 Agricultural Economics 8 Management 7 Resource management 7 Sustainability 6 more ... Agriculture 5 Case studies 5 Policy and Planning 5 Research 5 Social Psychology and Social Anthropology, (New March 2000) 5 Agricultural development 4 Environmental aspects 4 Environmental impact 4 Leisure, Recreation and Tourism Economics, (New March 2000) 4 Tourism and Travel 4 Agricultural research 3 CGIAR 3 Economic impact 3 Environmental management 3 Food Economics, (New March 2000) 3 Food security 3 Indicators 3 Methodology 3 Sustainable development 3 Techniques and Methodology 3 Tourism 3 Agricultural policy 2 Agriculture (General) 2 less ...