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We show that every Dedekind domain $R$ lying between the polynomial rings$\mathbb Z[X]$ and $\mathbb Q[X]$ with the property that its residue fields ofprime characteristic are finite fields is equal to a generalized ring ofinteger-valued polynomials, that is, for each prime $p\in\mathbb Z$ thereexists a finite subset $E_p$ of transcendental elements over $\mathbb Q$ in theabsolute integral closure $\overline{\mathbb Z_p}$ of the ring of $p$-adicintegers such that $R=\{f\in\mathbb Q[X]\mid f(E_p)\subseteq \overline{\mathbbZ_p}, \forall \text{ prime }p\in\mathbb Z\}$. Moreover, we prove that the classgroup of $R$ is isomorphic to a direct sum of a countable family of finitelygenerated abelian groups. Conversely, any group of this kind is the class groupof a Dedekind domain $R$ between $\mathbb Z[X]$ and $\mathbb Q[X]$.

Polynomial Dedekind domains with finite residue fields of prime characteristic