History 38 Politics and government 29 Economic conditions 20 Economic policy 13 Social conditions 11 Case studies 9 Foreign relations 9 Social policy 9 Architecture 8 Social aspects 8 Data processing 6 Design 6 Economic aspects 6 Safety measures 6 Economic integration 5 Interior decoration 5 Regional planning 5 Socialism 5 City planning 4 Education, Higher 4 Employment 4 Environmental policy 4 Government policy 4 History and criticism 4 Planning 4 Political aspects 4 Political participation 4 Qualitative research 4 Research 4 Sex role 4