Historical clue formulations

• "Yankee Doodle" has 16 of them — 2022-04-03
• They may be light or free — 2007-05-13
• Bible parts — 2005-08-14
• Most numbers have two or more — 2004-07-10
• Greeting card features — 2004-01-08
• Biblical units — 2003-06-15
• Haikus, e.g. — 2002-10-17
• Biblical passages — 2002-02-04