The Guide Star Catalog, Version 2.4.2 (GSC2.4.2)
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https://b2find.eudat.eu/dataset/ed04635d-3306-5a6a-bd0c-98bcf05c89a7
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The GSC II is an all-sky catalog based on 1" resolution scans of the photographic Sky Survey plates, at two epochs and three bandpasses, from the Palomar and UK Schmidt...
