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| | Omaña, Lourdes, González-Arreola, Celestina and Ramírez-Garza, Blanca Margarita Barremian planktonic foraminiferal events correlated with the ammonite zones from the San Lucas Formation, Michoacán (SW Mexico). Rev. mex. cienc. geol, 2005, vol.22, no.1, p.88-96. ISSN 1026-8774
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