Historical clue formulations

• Country addresses: Abbr. — 2015-04-10
• Old U.S.P.S. routing codes — 2011-07-03
• Country addresses: Abbr. — 2011-03-09
• Country mail rtes. — 2010-08-17
• Country mail rtes. — 2009-12-07
• Country addresses, for short — 2008-03-06
• Some mail services: Abbr. — 2006-12-22
• Some rtes. — 1995-12-20
• Country mail systems, for short — 1995-06-13