Acid-Base Nutrition (The PRAL Score)

Hi,
I came across J.Berardi’s article: “Covering Your Nutritional Acids(and Bases)”.He gives examples of meat and fruit etc. numbers (The PRAL score). The list is limited. I would like to know where I can find MORE on this topic. Maybe some nice web page or a book…would be nice.

Thanks everyone!

Cheers