  We use data collected by the CLEO III detector at CESR on the Upsilon(5S)
resonance to measure the inclusive yield of Ds mesons. Comparing with data
taken on the Upsilon(4S), which decays into lighter B mesons, we make a model
dependent estimate of the ratio of Bs(*)anti-Bs(*) to the total b anti-b quark
pair production at the Upsilon(5S) energy of (16.0+/-2.6+/-5.8)%.
