ANSWERS: 3
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I know what you're referring to, and my very good list of book binding terms doesn't list it: http://www.alibris.com/glossary/glossary-books The edge where the groove is, is called a "fore-edge" or a "front-edge" I thought maybe it was a "french groove", but I remain unconvinced.
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"notch" btw, is definitely the correct term.
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Thumb-tabbing, maybe?
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