Historical clue formulations

• Package drop-off sites: Abbr. — 2025-05-11
• Like all natural numbers: Abbr. — 2019-01-29
• Like one end of a battery: Abbr. — 2018-09-17
• > 0: Abbr. — 2017-10-05
• +: Abbr. — 2017-03-29
• Municipal mainstays: Abbr. — 2016-06-25
• +: Abbr. — 2015-06-16
• Opposite of neg. — 2014-10-20
• 2B, SS or CF — 2014-02-12
• Like one battery terminal: Abbr. — 2012-09-30
• Getters of letters: Abbr. — 2010-06-05
• Blood-type abbr. — 2010-06-01
• Like some poles: Abbr. — 2008-09-25
• On the plus side?: Abbr. — 2007-10-06
• Terminal abbr. — 2007-03-03
• Letter getters: Abbr. — 2006-10-20
• Like an anode: Abbr. — 2005-07-03
• Med. test result — 2004-07-28
• +: Abbr. — 2003-05-04
• Like one terminal of a battery: Abbr. — 2002-10-13
• Shortstop, e.g.: Abbr. — 2000-08-23
• Like some terminals: Abbr. — 1999-12-12
• Dropoff points: Abbr. — 1999-10-02
• Not neg. — 1999-01-26
• Mailing ctrs. — 1997-11-03
• Certain battery term. — 1996-11-21
• Neg.'s counterpart — 1995-06-16
• What "+" means: Abbr. — 1995-02-12