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observing aids

Title Posted By Updated/commented date Typesort icon
New Chinese Visual Observing Manual BSJ 1 year 45 weeks ago Page
Visual Observing Manual - Spanish BSJ 41 weeks 6 days ago Page
The Zurich Classification System of Sunspot Groups Matthew Templeton 3 years 13 weeks ago Page
Visual Observing Manual in Persian BSJ 2 years 34 weeks ago Page
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