Underdeveloped areas Economic conditions 35 Economic policy 27 Addresses, essays, lectures 25 Case studies 24 Economic development 20 Commerce 18 Foreign economic relations 17 International economic relations 14 Politics and government 14 Technology 14 International business enterprises 12 Social conditions 12 Economic aspects 11 Poor 11 Mathematical models 10 Agriculture 9 Education 9 Foreign relations 9 Social aspects 9 Urbanization 9 Cities and towns 8 Industries 8 Population 8 Finance 6 Sanitary engineering 6 Social policy 6 City planning 5 International cooperation 5 Investments, Foreign 5