And once again, thanks to Roberto for turning me on to this guy’s blog - one of my favorite writers on Italian wine, and this is a nice intro article on the Etna production area in Sicily.
http://www.wine-searcher.com/m/2014/09/what-s-the-big-deal-about-etna
He also briefly mentions Bill Nesto’s book in his article (link below) - another nice read if you want to know more about Sicilian wines, although the topics covered in Bill’s book are much broader than what’s grown on the slopes of Etna.