We report a new measurement of the pseudorapidity (eta) and transverse-ener
gy (Er) dependence of the inclusive jet production cross section in p (p) o
ver bar collisions at roots = 1.8 TeV using 95 pb(-1) of data collected wit
h the DO detector at the Fermilab Tevatron. The differential cross section
d(2)sigma/(dE(T)d eta) is presented up to \eta\ = 3, significantly extendin
g previous measurements. The results are in good overall agreement with nex
t-to-leading order predictions from QCD and indicate a preference for certa
in parton distribution functions.