History of the Americas 10 Social & cultural anthropology, ethnography 6 Archaeology 5 Applied ecology 4 History 4 Humanities 4 Sociology 4 Anthropology 3 Central government policies 3 Cultural studies 3 Development studies 3 Indigenous peoples 3 Media studies 3 Migration, immigration & emigration 3 20th century history: c 1900 to c 2000 2 Austria 2 Biography: historical, political & military 2 Biology, life sciences 2 Climate change 2 Collected biographies 2 Development economics & emerging economies 2 Earth sciences, geography, environment, planning 2 Ecological science, the Biosphere 2 Environmental management 2 Environmental policy & protocols 2 European history 2 Fascism & Nazism 2 Food & society 2 Genocide & ethnic cleansing 2 Geological surface processes (geomorphology) 2