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observing aids

Title Posted By Updated/commented date Typesort icon
Visual Observing Manual - Persian BSJ 12 weeks 6 days ago Page
Visual Observing Manual BSJ 12 weeks 6 days ago Page
Guidelines for new solar observers Matthew Templeton 4 years 8 weeks ago Page
AAVSO Bulletin Matthew Templeton 50 weeks 1 day ago Forum topic
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