  Preliminary results from spectrophotometric observations of galaxies with
very young starbursts are presented. Starburst galaxies with an age of the
burst in the range between 3 and 6 Myr have been observed and new detections of
Wolf-Rayet galaxies are reported. We discuss the origin of high excitation
nebular lines observed in these galaxies and their possible link with the
population of Wolf-Rayet stars.
