Historical clue formulations

• Encl. to an editor — 2016-05-12
• Coll. fraternity — 2016-01-10
• Letter encl. with a manuscript — 2015-03-31
• Autograph seeker's encl. — 2014-08-20
• Enclosure to an ed. — 2013-12-12
• MS. enclosure — 2012-11-21
• Motor oil letters — 2012-09-01
• R.S.V.P. facilitator: Abbr. — 2012-01-15
• Letter encl. to facilitate a reply — 2011-12-26
• Bill accompanier: Abbr. — 2011-12-17
• Enclosure with a ms. — 2011-12-07
• Major coll. fraternity — 2010-04-27
• It facilitates replying to a MS. — 2009-12-23
• MS. enclosure — 2009-09-26
• Reply facilitator: Abbr. — 2008-12-12
• R.S.V.P. facilitator: Abbr. — 2008-10-04
• Ed.'s request — 2006-01-05
• It might accompany a MS. — 2005-12-15
• Enclosure with a ms. — 2004-08-29
• Encl. to an editor — 2003-11-21
• MS. enclosure — 2003-11-20
• Freelancer's enc. — 2002-02-17
• Cover letter letters — 2000-03-04
• Ed.'s request — 1999-07-24
• Contest entry encl. — 1996-08-11
• Encl. with a manuscript — 1996-07-19
• Manuscript encl. — 1996-01-02
• Manuscript encl. — 1995-12-10
• Enclosure with a MS. — 1994-09-14
• Manuscript encl. — 1994-07-24
• Enclosure with a MS — 1994-07-09