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Books by A. Wallenquist

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An Attempt to Determine Photovisual Magnitudes without a Colour-Filter and a Study of the Colours and the Magnitudes of the Stars in the Galactic Cluster Messier 7 and Its Surroundings. Annalen v.d. Bosscha-Sterrenwacht Lembang (Java) volume3#4
An Attempt to Determine Photovisual Magnitudes without a Co…
By: A. Wallenquist
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