History 357 Economic conditions 237 Politics and government 172 Social conditions 84 Description and travel 73 Economic policy 71 Foreign relations 47 Biography 43 Indians of South America 39 Social life and customs 37 Agriculture 31 Civilization 30 Education 28 Industries 28 Economic aspects 27 Folklore 26 Commerce 24 History and criticism 24 Blacks 23 Slavery 20 Rural conditions 19 Foreign economic relations 18 Political activity 18 Portuguese language 18 Working class 18 Fiction 15 Religion 15 Armed Forces 14 Case studies 14 Missions 14