Historical clue formulations

• Latvia neighbor: Abbr. — 2013-05-07
• Neighbor of Lat. — 2012-11-02
• Neighbor of Poland: Abbr. — 2012-06-17
• Currier and Ives product: Abbr. — 2011-12-02
• Baltic land: Abbr. — 2010-01-10
• Neighbor of Pol. — 2007-05-04
• An S.S.R. — 2003-02-02
• Baltic country: Abbr. — 2001-01-11
• Neighbor of Pol. — 2000-08-12
• Art print: Abbr. — 1998-01-12