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1. When collecting books, how can you verify a certificate of authenticity for a book signed by author? what should it look like and who issues it?
2. If a book is in new, never used condition what effect does a black mark made by a magic marker on the external edges of pages have on it's value? i. e. With book closed the top or bottom of the book's pages is marked by a dot or completely blacked out with marker. marking isn't visible when book is open.
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