Études Sur Les Échinides Fossiles Du Département De L'yonne

Ce livre est une ?tude approfondie des ?chinides fossiles trouv?s dans le d?partement de l'Yonne. Les ?chinides sont des animaux marins ayant v?cu il y a des millions d'ann?es, et leur ?tude permet de mieux comprendre l'histoire g?ologique de la r?gion.

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