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\title OBSERVATIONAL CONSTRAINTS TO THE 

\title EVOLUTION OF MASSIVE STARS

\author Nino Panagia

\affil ESA/Space Telescope Science Institute

\affil 3700 San Martin Drive

\affil Baltimore, MD 21218

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\centerline{Invited Paper presented at the Roma-Trieste Workshop 1999}
\centerline{\it The Chemical Evolution of the Milky Way: Stars versus Clusters,}
\centerline{held 20--24 September 1999 at Vulcano Island (ME, Italy).}
\centerline{eds.\ F.\ Giovannelli \& F.\ Matteucci,}
\centerline{Kluwer-Holland (in press).}

\url 1414

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