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Cambridge, Mass., The American Association of Variable Star Observers, 1975. Soft Cover, 4to - over 9¾" - 12" tall, Very Good/Wraps, Very Good, Very nice clean copy containing laid-in letter from association director dated December, 1975 announcing publication of report. Pages pristine and no spine crease. Only fault is light browning to edges of white covers and a few flat creases at corners. A list of variables and observers is followed by astronomical charts incorporating 132,000 observations of 446 variables. Light curves of variables are computer plotted 10-day mean values. Program developed by Barbara L. Welther, Smithsonian Astrophysical Observatory of Center for Astrophysics. 155 pages, plus blank pages for notes.

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