We report on preliminary measurements of the Upsilon(1S),
Upsilon(2S) and Upsilon(3S) differential and integrated cross sections in
ppbar collisions at sqrt s = 1.8 TeV using a sample of 16.6 \pm 0.6 pb^-1
collected by the Collider Detector at Fermilab.  The three resonances were
reconstructed through the decay Upsilon -> mu^+mu^- in the rapidity region
|y| < 0.4.  The cross section results are compared to theoretical models of
direct bottomonium production.