  We describe a measurement of the mass of the top quark from the purely
hadronic decay modes of t-tbar pairs using all-jet data produced in p-pbar
collisions at sqrt{s} = 1.8 TeV at the Fermilab Tevatron Collider. The data,
which correspond to an integrated luminosity of 110.2 pb^-1, were collected
with the Dzero detector from 1992 to 1996. We find a top quark mass of 178.5 +
13.7 (stat) + 7.7(syst) GeV/c^2.
