PUBLICACIONES PERIODICAS 48 History 38 Economic conditions 36 Social sciences 33 Education 32 Philosophy 31 Social conditions 30 more ... History and criticism 28 Politics and government 25 Law 23 Research 22 Economics 18 Psychology 17 Science 16 Civilization 15 Communication 15 Political science 15 Study and teaching 15 Agriculture 14 Antiquities 13 Engineering 13 Medicine 12 Indians of South America 10 Literature 10 World politics 10 Architecture 9 Latin American literature 9 Mass media 9 Philosophie 9 Social aspects 9 less ...