TY - JOUR
AU - Catharine Garmany
AU - W. Vacca
BT - Publications of the Astronomical Society of the Pacific
DA - Jan-08-1991
DO - 10.1086/132826
PY - 1991
EP - 347
T2 - Publications of the Astronomical Society of the Pacific
TI - New spectral classifications for O-type stars in the Northern Hemisphere
UR - http://articles.adsabs.harvard.edu/full/1991PASP..103..347G
VL - 103
SN - 0004-6280
ER -