History 95 PUBLICACIONES PERIODICAS 95 Economic conditions 82 History and criticism 68 Social sciences 67 Education 66 Social conditions 63 más ... Philosophy 57 Politics and government 57 Economic history 54 Law 50 Economics 48 Research 47 Civilization 44 Psychology 38 Study and teaching 35 Political science 33 Latin American literature 30 Antiquities 28 Communication 28 Engineering 27 Science 27 Literature 26 Agriculture 24 Indians of South America 21 Management 21 Ethnology 20 Medicine 20 Architecture 19 Sociology 18 menos ...