Migration, immigration & emigration 42 Refugees & political asylum 33 European history 18 Sociology 17 History of medicine 16 Postwar 20th century history, from c 1945 to c 2000 16 Second World War 15 Human geography 12 International relations 12 Society & social sciences 12 Central government policies 11 Politics & government 11 Development studies 10 Human rights 10 Social & cultural anthropology, ethnography 8 Social impact of disasters 8 Political science & theory 7 Anthropology 6 Media studies 6 Society & culture: general 6 Education 5 Gender studies, gender groups 5 Political economy 5 Cultural studies 4 History 4 Humanities 4 Philosophy 4 Public administration 4 Sociology & anthropology 4 Asian history 3