Historical clue formulations

• J.F.K. or L.B.J.: Abbr. — 2019-08-14
• Quick signatures, quickly — 2018-10-07
• Document certifiers, for short — 2017-11-12
• Quick signature: Abbr. — 2016-10-09
• D.D.E. or J.F.K. — 2014-11-25
• The "F" and "B" of Samuel F. B. Morse, e.g.: Abbr. — 2013-07-29
• U.S.A. or U.K. — 2011-08-21
• The J. and K. in J. K. Rowling: Abbr. — 2010-12-13
• "I" and "M" in I. M. Pei: Abbr. — 2007-12-20
• They stand for something: Abbr. — 2007-10-19
• Some O.K.'s, for short — 2006-04-16
• Some needlework: Abbr. — 2004-10-09
• "Everything ___ place" — 2003-09-08
• J.F.K., e.g. — 2001-07-13
• Everything ___ place — 2000-07-11
• Some tree carvings: Abbr. — 1996-05-25