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- 35mm slide: 11289
- Date of Photo
- World Region
- Cone of percussion: (a-d) Theoretical stages in the fracture. (e) A flake removed with incomplete conical fracture. (f) An actual cone preserved intact. (i.e. corresponding to d).
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- Text/Graphic/Model: Chart/Graph
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- Book Citation: "Flint Implements; An Account of Stone Age Techniques and Cultures," by William Watson; Fig. 1, p 16. London: The Trustees of the British Museum, 1956.
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