  We present measurements of the b-bbar production cross section and angular
correlations using the D0 detector at the Fermilab Tevatron p-pbar Collider
operating at sqrt(s) = 1.8 TeV. The b quark production cross section for
|y(b)|<1.0 and p_T(b)>6 GeV/c is extracted from single muon and dimuon data
samples. The results agree in shape with the next-to-leading order QCD
calculation of heavy flavor production but are greater than the central values
of these predictions. The angular correlations between b and bbar quarks,
measured from the azimuthal opening angle between their decay muons, also agree
in shape with the next-to-leading order QCD prediction.
