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| Esquivel-Macías, Carlos, León-Olvera, Rita Gabriela and Flores-Castro, Kinardo Paleoenvironment and biostratigraphy of the Upper Sinemurian (Lower Jurassic) of the Huayacocotla Formation in East-Central Mexico. Bol. Soc. Geol. Mex, 2017, vol.69, no.3, p.739-770. ISSN 1405-3322
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