  Cohomological induction gives an algebraic method for constructing
representations of a real reductive Lie group $G$ from irreducible
representations of reductive subgroups. Beilinson-Bernstein localization
alternatively gives a geometric method for constructing Harish-Chandra modules
for $G$ from certain representations of a Cartan subgroup. The duality theorem
of Hecht, Mili\vci\'c, Schmid and Wolf establishes a relationship between
modules cohomologically induced from minimal parabolics and the cohomology of
the $\ms{D}$-modules on the complex flag variety for $G$ determined by the
Beilinson-Bernstein construction. The main results of this paper give a
generalization of the duality theorem to partial flag varieties, which recovers
cohomologically induced modules arising from nonminimal parabolics.
