Historical clue formulations

• Image on the back of a Canadian quarter — 2015-12-19
• Reindeer relative — 2015-11-22
• Image on the reverse of a Canadian quarter — 2015-01-13
• American reindeer — 1995-11-22
• Famously cold Maine town — 1994-12-23
• Reindeer relative — 1994-08-25