Yes, like the grading companies, who are happy to tell you what to think, the book can help you to ignore your direct experience of observing the card. So if you have a card that says Copyright 1889, you can learn from the SGC experts that it is a 1887 Old Judge. And if you've got a card with the number "0137" on it, you can realize that in fact the experts in the OJ book will tell you that it is really numbered "252-2". This way you can learn to value expert opinion over what you see with your own eyes.
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