Data from proton-antiproton collisions at high energy provide
important information on constraining the quark and gluon distributions in the
nucleon and place limits on quark substructure.  The W asymmetry data
constrains the slope of the d/u quark distributions and significantly reduces
the systematic error on the extracted value of the W mass.  Drell-Yan data at
high invariant mass provides strong limits on quark substructure on alpha_s,
and the gluon distributions can be extracted from high P_t jet data and direct
photons.