Historical clue formulations

• Linings of nautilus shells — 2026-07-19
• Materials from mollusk shells — 2020-11-29
• Nautilus shell liners — 2012-04-21
• Button materials — 2009-11-22
• Mother-of-pearls — 2008-12-02
• Shell liners — 2006-06-08
• Mother-of-pearls — 1997-08-04