  Disorder is more the rule than the exception in natural and synthetic
materials. Nonetheless, wave propagation within inhomogeneously disordered
materials has received scant attention. We combine microwave experiments and
theory to find the spatial variation of generic wave propagation quantities in
inhomogeneously disordered materials. We demonstrate that wave statistics
within samples of any dimension are independent of the detailed structure of a
material and depend only on the net strengths of distributed scattering and
reflection between the observation point and each of the boundaries.
