Revista mexicana de ciencias geológicas On-line version ISSN 2007-2902Print version ISSN 1026-8774
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BLANCO-PINON, Alberto and GARIBAY-ROMERO, Luis M..Reply to the comment by Stinnesbeck et al. on The oldest stratigraphic record of the Late Cretaceous shark Ptychodus mortoni Agassiz, from Vallecillo, Nuevo León, northeastern Mexico". Rev. mex. cienc. geol [online]. 2008, vol.25, n.2, pp.367-368.
ISSN 2007-2902.