TY - RPRT TI - Wolf-Rayet stars : proceedings of a symposium held at the Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, Colorado, June 10-14, 1968 AU - Gebbie, Katharine B AU - Thomas, Richard N PY - 1968 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS SP 307 DO - 10.6028/NBS.SP.307 ER -