  We present a measurement of the B0 B0-bar oscillation frequency using a
flavor tagging method based on correlations of B meson flavor with the charge
of other particles produced in p p-bar collisions at sqrt{s} = 1.8 TeV. Such
correlations are expected to arise from b quark hadronization and from B**
decays. We partially reconstruct B mesons using the semileptonic decays B0 ->
lepton D(*)- X. and B+ -> lepton D0-bar X$. From the oscillation frequency, we
obtain the mass difference between the two B0 mass eigenstates, Delta m_d =
0.471 {+0.078} {-0.068}(stat) +- 0.034 (syst) hbar ps-1, and measure the
efficiency and purity of this flavor tagging method for both charged and
neutral B mesons.
