I have the PCGS, ANA (6th edition), and Photograde (19th edition) grading books. I generally refer to the ANA book the most often. It has the most specific descriptions of each grade and the pictures are better than Photograde. If I am unsure about a grade, I'll refer to the PCGS book as well. Photograde is a new purchase, but I'm not that impressed with it so far but I haven't had a chance to read much of it.


















