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Pith - Wikipedia
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Pith Wood Royal Pithwood A*F 17794 - HP17794
Gravity Engineers Academy - Gravity Nutshells... PITH/ MEDULLA – Innermost central portion or core of a tree. Size varies from 1.5 – 10 mm HEART WOOD – Inner annular rings surrounding the
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wood - Wood as a material | Britannica
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pith — Woodworking School — Port Townsend School of Woodworking