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Year: 1949 Publisher: Leiden Stafleu
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Book
Year: 1960 Publisher: Leiden : Stafleu,
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Year: 1960 Publisher: Leiden Berchem Antwerpen L. Stafleu & Zoon De Internationale Pers
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Astronomie --- Sciences pures --- Sterrenkunde --- Zuivere wetenschappen --- Astronomie --- Sterrenkunde --- 52 (07)
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