Research & information: general 99 History of engineering & technology 64 Sociology 60 Politics & government 54 Central government policies 51 Technology: general issues 49 Medicine 48 Education 40 Biology, life sciences 37 Media studies 35 International relations 31 Applied ecology 30 European history 27 Development economics & emerging economies 25 City & town planning - architectural aspects 24 Literature: history & criticism 24 Political science & theory 24 Economics 22 Human geography 22 Humanities 22 Environmental management 20 Educational strategies & policy 19 Gender studies, gender groups 19 Migration, immigration & emigration 19 linguistics 18 Environmentally-friendly architecture & design 17 Human rights 17 Social & cultural history 16 Environmental science, engineering & technology 15 Social & cultural anthropology, ethnography 15