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Cooper, A. H. The lower Ordovician stratigraphy of the Dornes-Figueíró dos Vinhos area, central Portugal, with descriptions of Merostomichnites ichnosp. and Rosselia socialis; two previously unrecorded trace fossi : unrecorded trace fossil. A.H. Cooper - M. Romano. In Comunicacöes dos Servicos Geológicos de Portugal , Comunicacöes dos Servicos Geológicos de Portugal. s. 73-82 : .1982, Tom.68, Fas.1.
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