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![](./images/clear.gif) 1.- BIOESTRATIGRAFIA Y ESTRUCTURA DEL CRETACICO SUPERIOR DE LA VALL D'ALINYA, PIRINEO ORIENTAL, PROVINCIA DE LLEIDA
1988
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![](./images/clear.gif) 2.- REEVALUATION OF LEPIDORBITOIDES EVOLUTION AS A FUNCTION OF THE AGE RELATIONS BETWEEN SPECIES AS ESTABLISHED WITH NANNOPLANKTON BIOSTRATIGRAPHY
1988
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