HST Observations of Cool White Dwarf Stars Shipman, H. ; Barnhill, M. ; Roby, S. ; Bues, I. ; Cordova, F. ; Hammond, G. ; Hintzen, P. ; Koester, D. ; Liebert, J. ; Oswalt, T. ; Starrfield, S. ; Wegner, G. ; Weidemann, V. Abstract Publication: American Astronomical Society Meeting Abstracts Pub Date: September 1992 Bibcode: 1992AAS...181.0704S