History 368 History and criticism 130 Research 101 Politics and government 96 Tourism and Travel 85 Plant Breeding and Genetics 82 Policy and Planning 76 Agricultural Economics 75 Social aspects 73 Biotechnology 71 Leisure, Recreation and Tourism Economics, (New March 2000) 69 Social Psychology and Social Anthropology, (New March 2000) 69 Tourism 67 Plants 66 Sustainability 65 Methodology 63 Management 62 Online social networks 59 Natural Resource Economics, (New March 2000) 58 Philosophy 58 Plant Pests, (New March 2000) 58 Social conditions 57 Online journalism 56 Social media 55 Agriculture 53 Mathematics 52 Journalism 51 Political aspects 50 Plant pests 49 Horticultural Crops, (New March 2000) 48