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\title PRE-SUPERNOVA EVALUATION OF MASSIVE STARS 

\author Nino Panagia$^1$

\affil Space Telescope Science Institute

\affil 3700 San Martin Drive

\affil Baltimore, MD 21218

\author Giuseppe Bono

\affil Osservatorio Astronomico di Roma

\affil Via Frascati 33

\affil Monte Porzio Catone, Italy

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\centerline{Invited Review presented at the ST ScI 1999 May Symposium}
\centerline{\it The Largest Explosions since the Big Bang: Supernovae and Gamma Ray Bursts,}
\centerline{held 3--6 May 1999 at Baltimore, MD.}
\centerline{eds.\ M.\ Livio, N.\ Panagia, \& K.\ Sahu,}
\centerline{CUP-Cambridge (in press).}

\url 1417

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$^1$On assignment from the Space Science Department of ESA.

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