Neogene paleontology in the northern Dominican Republic: 12. The genus Spondylus (Bivalvia: Spondylidae) 13. The class Echinoidea (Echinodermata)
H.E. Vokes; E.H. Vokes, P.M. Kier
no page or plate numbers noted. # 12 written by H. E. and E.H. Vokes. #13 written by P.M. Kier
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