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| Ramírez-Arriaga, Elia, Martínez-Hernández, Enrique and Prámparo, Mercedes B. Palynomorph assemblages of the Cuayuca Formation (Paleogene), Puebla, southern Mexico. Part 1: trilete spores, monolete spores and gymnosperm pollen. Ameghiniana, Sept 2005, vol.42, no.3, p.567-578. ISSN 0002-7014
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