Historical clue formulations

• Turpentine-yielding conifer — 2022-01-08
• Sturdy floor wood — 2019-07-13
• Conifer that loses its needles in the autumn — 2019-03-18
• Conifer with durable wood — 2011-03-20
• Coniferous tree — 2004-04-27
• Tamarack tree — 2002-08-29
• Tough, durable wood — 2001-01-21
• Durable wood — 1997-05-10
• Tough-wooded conifer — 1996-03-13
• Durable wood — 1995-10-15