The Progenitor Masses of Wolf-Rayet Stars and Luminous Blue Variables Determined from Cluster

We combine new CCD UBV photometry and spectroscopy with that from the nliterature to investigate 19 Magellanic Cloud OB associations that contain nWolf-Rayet (WR) and other types of evolved massive stars. Our spectroscopy nreveals a wealth of newly identified interesting objects, including early nO-type supergiants, a high mass double-lined binary in the S..