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Paul SI'm pretty much with Al. Get you hands on some raw in the issues you are looking for, in a few different grades that you can afford. Look at them, touch 'em, smell 'em, take 'em to bed with you...don't eat them though Re graded, if they are too much to purchase then go to shows and card stores (a dying breed) if you can, and get some good close looks. Soon, you'll get an intuition about the whole thing -- it'll be like being able to pick out your own dog among a group of identical breed.
*edited to use the word "breed" twice.