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NSF-DOE Vera C. Rubin Observatory launches real-time discovery machine for monitoring the night sky

NSF-DOE Vera C. Rubin Observatory launches real-time discovery machine for monitoring the night sky The NSF-DOE Vera C. Rubin Observatory, jointly funded by the U.S. National Science Foundation and the U.S. Department of Energy's Office of Science, has released its first alerts documenting astronomical events spotted by the observatory. NSF-DOE… Read more at nsf.gov
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Free English Grammar E-Book

Ce E-Book contient les régles du grammaire anglais ,il va vous permettre de mieux comprendre et apprendre les régles du grammaire d'anglais dans un temps trés court .

ℹ️ Méthode de téléchargement 
1.cliquer sur le titre de livre
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3.le telechargement se déroule automatiquement  



lien de téléchargement : Free English Grammar E-Book



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