History 25 Condiciones económicas 19 Historia 19 Economic integration 18 Civilización 13 Civilization 13 Politics and government 9 espandi ... Conflicto social 7 Política y gobierno 7 Social conflict 7 Economic conditions 6 Periodicals 6 Social sciences 5 Ciencias sociales 4 Economics 4 Election law 4 Elections 4 Derecho electoral 3 Economic history 3 Elecciones 3 PUBLICACIONES PERIODICAS 3 Research 3 Animal culture 2 Anuarios 2 Aquatic biology 2 Education 2 Social conditions 2 Veterinary medicine 2 Aquatic Ecosystems 1 Automobile industry and trade 1 riduci ...