We present a measurement of the cross section for production of
two or more jets as a function of dijet mass, based on an integrated
luminosity of 86 pb-1 collected with the Collider Detector at Fermilab.
Our dijet mass spectrum is described within errors by next-to-leading order
QCD predictions using CTEQ4HJ parton distributions, and is in good agreement
with a similar measurement from the D0 experiment.