On dimorphism in Jurassic Ammonites: some reflexions

Enay,R. Banisters, K.E. (eds.) ; Geistdoerfer,P. (Mus. Natl. Hist. Nat., Lab. Ichtyol. Generale et appliquee, 43 rue Cuvier, 75231 Paris Cedex 05, France) ; Hureau, J.C

1976

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