Historical clue formulations

• Grass for cordage — 2014-06-04
• Grass for some baskets — 2012-02-11
• Hardy grass — 1996-12-15
• Grass for making paper — 1996-07-19
• Cordage grass — 1996-04-14
• Grass used for making paper — 1994-10-09
• Cordage grass — 1994-03-26