Social conditions 160 Economic conditions 71 Politics and government 50 History 9 Economic development 8 Social classes 8 Congresses 7 Economic policy 5 Case studies 4 Communism 4 Social change 4 Sociology 4 Civilization 3 Directories 3 Foreign economic relations 3 Foreign relations 3 Power (Social sciences) 3 Relations 3 Research 3 Urbanization 3 Capitalism 2 Cities and towns 2 Dependency on foreign countries 2 Description and travel 2 Economic aspects 2 Industries 2 Middle class 2 Revolutions 2 Rural conditions 2 Social aspects 2