Free Sourdough bread e-book for beginners

I am came across this free e-book which might be helpful for new sourdough enthusiast looking to gain more knowledge.

If you sign up for the free newsletter from Cultures for Health, you can download the free 208 page Sourdough e-book. A bit advertorial like but contains lots of interest tidbits of information.

http://www.culturesforhealth.com/free-ebooks-fermented-cultured-foods