"The Guide Star Catalog, Volume 1," or GSC, "which has been constructed to support the operational need of the Hubble Space Telescope (HST) for off-axis guide stars, contains 18,819,291 objects in the seventh to sixteenth magnitude range, of which more than 15 million are classified as stars."
--From the CD-ROM jacket
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Published in 1989 by Association of Universities for Research in Astronomy, Inc..
Rob Swigart gave the materials for this work to Dene Grigar in July of 2022.
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