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Ammonoids from the Maastrichtian (Late Cretaceous) at El Zancudo, Nuevo Laredo, Tamaulipas, Mexico Ifrim,Christina - Stinnesbeck,Wolfgang
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Microfossils, paleoenvironments and biostratigraphy of the Mal Paso Formation (Cretaceous, upper Albian), State of Guerrero, Mexico Filkorn,Harry F. - Scott,Robert W.
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