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For any finite group G and integer i, let $\mathcal{H}^i(G)$ be the set ofall the isomorphism classes of the Galois cohomology groups$\hat{H}^i(K/k,E_K)$, where K/k runs over all the unramified G-extension ofnumber fields and E_K denotes the global unit group of K. We will determine$\mathcal{H}^i(G)$ for i=0,1,2, and 4 in the case where G is a finite p-group.

On the abelian groups which occur as Galois cohomology groups of global unit groups