Social & cultural history 4 20th century history: c 1900 to c 2000 3 Botany & plant sciences 2 History of the Americas 2 International trade 2 Trees, wildflowers & plants 2 Agriculture & related industries 1 Biology, life sciences 1 Computer modelling & simulation 1 Dance 1 Educational: Music 1 Football (Soccer, Association football) 1 Geopolitics 1 Globalization 1 History of education 1 History of ideas 1 History of sport 1 Individual artists, art monographs 1 Industrial chemistry 1 International relations 1 Performance art 1 Political structure & processes 1 Rural communities 1 Rural planning 1 Social & cultural anthropology, ethnography 1 Social issues & processes 1 Social research & statistics 1 Theatre: individual actors & directors 1