  In the course of its operation, the EGRET experiment detected high-energy
gamma ray sources at energies above 100 MeV over the whole sky. In this
communication, we search for large-scale anisotropy patterns among the
catalogued EGRET sources using an expansion in spherical harmonics, accounting
for EGRET's highly non-uniform exposure. We find significant excess in the
quadrupole and octopole moments. This is consistent with the hypothesis that,
in addition to the galactic plane, a second mid-latitude (5^{\circ} < |b| <
30^{\circ}) population, perhaps associated with the Gould belt, contributes to
the gamma ray flux above 100 MeV.
