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observing aids

Title Posted Bysort icon Updated/commented date Type
The Zurich Classification System of Sunspot Groups Matthew Templeton 4 years 29 weeks ago Page
Charts and Sequences Update January 2012 SXN 4 years 2 weeks ago Page
Charts and Sequences Update September 2011 SXN 4 years 19 weeks ago Page
Mentor Program SXN 48 weeks 2 days ago Page
AAVSO Bulletin 74 for 2011 weo 3 years 50 weeks ago Page
AAVSO Bulletin 75 for 2012 weo 2 years 51 weeks ago Page
WebObs willmcmain 1 year 38 weeks ago Page
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