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observing aids

Title Posted By Updated/commented date Typesort icon
2011 JD Calendar BSJ 4 years 36 weeks ago Page
Visual Observing Manual in Persian BSJ 3 years 26 weeks ago Page
Visual Observing Manual - Spanish BSJ 1 year 34 weeks ago Page
The Zurich Classification System of Sunspot Groups Matthew Templeton 4 years 5 weeks ago Page
AAVSO Bulletin Matthew Templeton 1 year 46 weeks ago Forum topic
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