History 324 History and criticism 116 Research 91 Politics and government 85 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 Plants 66 Plant Breeding and Genetics 65 Sustainability 65 Tourism 64 Biotechnology 60 Methodology 60 Social aspects 60 Online social networks 59 Natural Resource Economics, (New March 2000) 58 Plant Pests, (New March 2000) 58 Online journalism 56 Social media 54 Social conditions 50 Plant pests 49 Horticultural Crops, (New March 2000) 48 Journalism 47 Plant Production 47 Man 46 Management 46 Marketing 44 Philosophy 44