History 148 Indians of South America 102 Historia 88 Politics and government 74 Social conditions 59 Law 50 Derecho 49 Law and legislation 44 Economic conditions 37 Legislación 35 Social aspects 33 Social life and customs 33 Derecho constitucional 30 Education 28 Constitutional law 27 Política y gobierno 27 Educación 26 Economic development 25 Social movements 25 Emigration and immigration 24 Derecho penal 23 Criminal law 22 Government relations 22 Legislation 21 Derecho civil 20 Civil law 19 Derecho y legislación 18 Education, Higher 17 Environmental protection 17 Social sciences 17