History 339 History and criticism 118 Politics and government 96 Tourism and Travel 85 Policy and Planning 76 Agricultural Economics 72 Leisure, Recreation and Tourism Economics, (New March 2000) 69 Social Psychology and Social Anthropology, (New March 2000) 69 Sustainability 66 Plant Breeding and Genetics 65 Tourism 62 Social conditions 59 Natural Resource Economics, (New March 2000) 58 Plant Pests, (New March 2000) 58 Plants 57 Plant pests 49 Horticultural Crops, (New March 2000) 48 Biotechnology 47 Plant Production 47 Man 46 Forests and Forest Trees (Biology and Ecology) 44 Taxonomy and Evolution 44 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 44 Behaviour 43 English literature 40 Techniques and Methodology 40 Biological Resources (Plant) 39 Case studies 39 Livestock 39 Natural enemies 39