Historical clue formulations

• Hardwood whose bark is sometimes used as paper — 2026-09-21
• Tree with papery bark — 2025-07-30
• Canoe maker's bark — 2023-08-18
• Tree with papery bark — 2021-10-13
• Source of bark for canoes — 2018-03-14
• Tree with smooth bark — 2017-12-19
• Canoe builder's bark source — 2016-12-25
• Tree with papery bark — 2016-07-11
• Graceful tree — 2006-03-29
• Switch material — 2002-10-03
• Switch material — 2002-05-05
• Canoe material — 2002-04-17
• Hazel's cousin — 1997-10-15