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observing aids

Title Posted By Updated/commented date Typesort icon
Visual Observing Manual - Turkish BSJ 1 year 39 weeks ago Page
SID Monitoring Group FAQ Matthew Templeton 3 years 10 weeks ago Page
AAVSO Bulletin 75 for 2012 weo 2 years 26 weeks ago Page
Visual Observing Manual - French BSJ 2 years 12 weeks ago Page
Accuracy and Consistency in the Production of the American Sunspot Number (Ra) Matthew Templeton 1 year 40 weeks ago Page
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