Historical clue formulations

• Place to find wds. — 2014-02-10
• Webster's ref. — 2012-06-24
• Webster's, e.g.: Abbr. — 2011-07-25
• Wordsmith's ref. — 2009-03-25
• Webster's, e.g.: Abbr. — 2007-10-25
• Crossworder's crutch: Abbr. — 2006-07-17
• Ref. book — 1997-10-04
• Webster's, e.g.: Abbr. — 1997-08-11
• Ref. work — 1995-03-19