Sorry i missed this one DO'h but for the future if you select the geo in object mode (no need to select all verts) then run a merge verts or in 2015 merge components that should do it you may need to tweak the threshold / tolerance a bit.
All the best
David
From a readers' Q and A column in TV GUIDE: "If we get involved in a nuclear war, would the electromagnetic pulses from exploding bombs damage my videotapes?"