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observing aids

Title Posted By Updated/commented date Typesort icon
Visual Observing Manual BSJ 26 weeks 4 days ago Page
Guidelines for new solar observers Matthew Templeton 4 years 22 weeks ago Page
Visual Observing Manual - Persian BSJ 26 weeks 4 days ago Page
AAVSO Bulletin Matthew Templeton 1 year 11 weeks ago Forum topic
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