African Journal Online
Beech Tree Publishing
British Library Direct
The Cochrane Library
Geological Society
Mary Ann Liebert
Mineralogical Society of Great Britain & Ireland
National Academy Press (US)(Libre en 2008)
Oxford University Press E-Journal
Royal Society of Chemistry Archive
University of California Press
University of Chicago
GaleVirtual (Clave de Acceso: uescnn3003)
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