Third Solar Sunspot Number Workshop - Tucson January 2013

Many thanks to Dr. Salvador Aguirre for correspondence on this topic, his Blog:
http://drsaguirremexico.blogspot.com/

Very interesting presentation slides at:
http://ssnworkshop.wikia.com/wiki/Presentations_3

Dr. Leif Svalgaard Research Page:
http://www.leif.org/research/

AAVSO Solar Section:
http://www.aavso.org/solar
http://www.aavso.org/solar-bulletin