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observing aids

Title Posted By Updated/commented date Typesort icon
2013 JD Calendar BSJ 1 year 20 weeks ago Page
Visual Observing Manual - Spanish BSJ 16 weeks 2 days ago Page
Accuracy and Consistency in the Production of the American Sunspot Number (Ra) Matthew Templeton 22 weeks 1 day ago Page
AAVSO Bulletin 75 for 2012 weo 1 year 9 weeks ago Page
AAVSO Bulletin Matthew Templeton 28 weeks 3 days ago Forum topic
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