  The cross sections for W and Z production in p-pbar collisions at sqrt(s)=1.8
TeV are measured using the D0 detector at the Fermilab Tevatron collider. The
detected final states are W->e nu, Z->ee, W->mu nu, and Z->mu mu. In the ratio
of these measurements, many common sources of systematic error cancel and we
measure the ratio of the W and Z cross-sections. Assuming standard model
couplings, this result is used to determine the width of the W boson and to set
a limit on the decay W->t-bbar.
