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UBV Photometry of OB + Stars in the Southern Milky Way

1226 new observations are combined with previously published results of the author to yield an internally consistent set of magnitudes and colors on the international UBV system for 666 stars classified as OB + in the Stephenson-Sanduleak OB star survey. The U−B, B−V diagram indicates that these stars consist primarily of O-type stars and early B-type supergiants, reddened by up to E B−V = 2.1 mag