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  • 1 Universitat de Valencia-CSIC Instituto de Historia de la Ciencia y Documentación López Piñero Valencia 46010 Spain
  • | 2 Universidad Politécnica de Valencia Departamento de Sistemas Informáticos y Computación Valencia Spain
  • | 3 Universitat de Valencia Biblioteca de Ciencias Sociales Valencia Spain
  • | 4 Long Island University Palmer School of Library and Information Science Greenvale USA
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This paper studies the main characteristics of the citation indexes currently developed in Spain. The paper compares the impact factors offered by Spanish citation indexes with the impact factor of Spanish journals also collected by the JCRs of the ISI (SCI and SSCI) over a five-year period (2001–2005). Spanish journals published in English have higher impact factor scores in the JCR databases of the ISI than in Spanish citation indexes.