Alles van: Ejnar Hertzsprung
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Ejnar Hertzsprung Estimates of 64 variable stars on plates of the β cantauri region, taken by the late H. van Gent
Engels | 54 pagina's | Enschedé, Haarlem | 1950
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Ejnar Hertzsprung Mean colour equivalents and hypothetical angular semi-diameters of 734 stars brighter than the 5th magnitude and within 95° of the North Pole
Engels | 55 pagina's | Enschede, Haarlem | 1922
Gedrukt boek
Engels