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Sumario:Prompt dimuon production has been measured. Events with mass up to 25 GeV/c/sup 2/ are observed, as well as the J and gamma resonances. Cross sections are given for J and gamma production. For the continuum, the scaling function F( tau ) is measured at very small values of square root tau =m/ square root s covering the range 0.05< square root tau <0.20.