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Didactics of sciences --- Didactics of primary education --- Solar system --- Sterren, planeten, ruimtevaart --- 629.7 ) Ruimtevaart --- astronomie --- ruimtevaart --- sterrenkunde --- zonnestelsel --- Astronomie --- Heelal --- Kometen --- Maan --- Meteoren --- Planeten --- Sterren --- Zon --- Zonsverduisteringen --- 551.4
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Communications de l'Observatoire Royal de Belgique
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