Mathematics 183 Computer science 89 Tourism 81 Tourism and Travel 70 Leisure, Recreation and Tourism Economics, (New March 2000) 69 History 57 Management 41 Environmental ecology-- Island ecology-- Desert Ecology 40 Philosophy 40 Literature 37 English fiction 34 Religion 34 Botany 33 Combinatorial analysis 32 English literature 32 Discrete mathematics 29 History and criticism 28 Mathematical recreations 28 Social Psychology and Social Anthropology, (New March 2000) 28 General management 27 Ecotourism 26 Discrete-time systems 25 Soil Science and Agricultural Chemistry 25 Mathematical models 24 Recreation 24 Marketing 23 Sustainability 23 Tourism development 23 Marketing and Distribution 22 Data processing 21