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Galaxies --- 52 <063> --- HR diagrams --- -Stars --- -Sidereal system --- Circumstellar matter --- H-R diagrams --- Hertzsprung-Russell diagrams --- Russell diagrams --- Stars --- Astronomie. Astrofysica. Ruimteonderzoek. Geodesie--Congressen --- Congresses --- Russell, Henry Norris --- Congresses. --- Russell, Henry Norris, --- -Astronomie. Astrofysica. Ruimteonderzoek. Geodesie--Congressen --- -Congresses