  We investigate graph-directed iterated function systems in mixed Euclidean
and p-adic spaces. Hausdorff measure and Hausdorff dimension in such spaces are
defined, and an upper bound for the Hausdorff dimension is obtained. The
relation between the Haar measure and the Hausdorff measure is clarified.
Finally, we discus an example in ${Bbb R}\times{\Bbb Q}\sb 2$ and calculate
upper and lower bounds for its Hausdorff dimension.
