Economic conditions 495 History 331 Economic policy 274 Petroleum industry and trade 265 Social conditions 196 Politics and government 181 Statistics 102 more ... Agriculture 91 Social policy 88 Economic aspects 87 Periodicals 82 Government policy 74 Foreign economic relations 62 Population 61 Finance, Public 57 Commerce 56 City planning 54 Economic history 53 Industries 51 Labor unions 51 Socialism 50 Housing 40 Government ownership 39 Social aspects 36 Women 36 Community development 33 Finance 33 Labor supply 33 Banks and banking 31 Land reform 31 less ...