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Caballero Donoso, José María and Casquet, César and Galindo Francisco, Mª del Carmen and González Casado, José Manuel and Snelling, N. and Tornos Arroyo, Fernando (1992) Dating of hydrothermal events in the Sierra del Guadarrama, Iberian Hercynian Belt. Spain. Geogaceta, 11 . pp. 18-22. ISSN 0213-683X