  Results are presented on a measurement of the ttbar pair production cross
section in ppbar collisions at sqrt{s} = 1.8 TeV from nine independent decay
channels. The data were collected by the Dzero experiment during the 1992-1996
run of the Fermilab Tevatron Collider. A total of 80 candidate events are
observed with an expected background of 38.8 +- 3.3 events. For a top quark
mass of 172.1 GeV/c^2, the measured cross section is 5.69 +- 1.21 (stat) +-
1.04 (sys) pb.
