Tourism 35 Ecotourism 11 BUSINESS & ECONOMICS / Industries / Hospitality, Travel & Tourism 10 Tourism and Travel 9 Leisure, Recreation and Tourism Economics, (New March 2000) 8 Heritage tourism 7 Sustainability 6 ECOTOURISM 5 History 5 Sustainable development 5 TRAVEL / General 5 Travel 5 Hospitality industry 4 Mathematics 4 Sustainable tourism 4 Tourism-Developing countries 4 World 4 Case studies 3 Conservation 3 Cultural tourism--Heritage tourism 3 Destination planning and management tourism 3 Economic development 3 Management 3 Medical tourism 3 Natural Resource Economics, (New March 2000) 3 Philosophy 3 Policy and Planning 3 Research 3 SUSTAINABLE TOURISM 3 Social Psychology and Social Anthropology, (New March 2000) 3