Historical clue formulations

• Orgs. — 2019-03-03
• Grps. — 2015-07-21
• AARP and others: Abbr. — 2015-07-05
• Some convention organizers: Abbr. — 2015-03-19
• Grps. — 2014-10-29
• Federations: Abbr. — 2014-04-29
• Orgs. — 2013-11-28
• Professional grps. — 2013-11-26
• They often have organs: Abbr. — 2013-05-19
• Pro grps. — 2013-04-13
• Professional grps. — 2010-04-25
• Grps. — 2009-09-24
• Socs. — 2008-05-31
• Clubs: Abbr. — 2008-02-01
• Clubs: Abbr. — 2006-12-23
• Leagues: Abbr. — 2003-08-08
• Grps. — 2003-06-11
• Grps. — 2000-12-26
• Orgs. — 2000-08-20
• Clubs: Abbr. — 1999-08-29
• Orgs. — 1999-08-16
• Special interest grps. — 1994-04-01
• Orgs. — 1994-02-06