Ultrastructural Studies on Graptolites, 2 : the Periderm and Its Derivatives in the Graptoloidea / by Adam Urbanek and Kenneth M. Towe - Urbanek, Adam; Towe, Kenneth M. (Washington : Smithsonian Institution Press)
Keywords: 1.INVERTEBRADOS FÓSILES 2.PALEONTOLOGÍA -ORDOVÍCICO -SILÚRICO