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In Bordes's typology for the Lower and Middle Paleolithic, he defines four major classes of side scrapers: single, double, convergent, and transverse forms. Data from three Middle Paleolithic assemblages, one from Iran and two from France, suggest that these scraper classes may be interpreted as representing stages in reduction of flake blanks through continued reuse and remodification.
Harold L. Dibble (Thu,) studied this question.
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