Historical clue formulations

• Few and far between — 2025-07-20
• Not easy to find — 2024-11-21
• Rare — 2024-04-11
• Few and far between — 2023-08-27
• Like hen's teeth — 2020-10-31
• Hard to find — 2016-05-15
• Pretty hard to find — 2014-02-27
• Like embargoed goods — 2013-05-12
• "Make yourself ___" — 2010-08-08
• Limited — 2002-11-08
• Like capital letters in many E. E. Cummings poems — 2002-08-25
• Numismatist's description — 2000-09-27
• Like cabs on a rainy day — 1999-12-28
• Like hen's teeth — 1996-11-04