LTRS
4 letters
Historical clue formulations
- Much mail: Abbr. — 2021-09-28
- Some paperwork: Abbr. — 2017-03-17
- Mail: Abbr. — 2016-08-15
- Posted pieces: Abbr. — 2012-10-06
- U.S.P.S. deliveries — 2012-06-21
- U.S.P.S. deliveries — 2009-10-18
- Posts: Abbr. — 2007-11-03
- P.O. items — 2006-10-13
- P.O. items — 2006-07-16
- P.O. items — 2006-06-12
- Mail: Abbr. — 2004-07-21
- U.S.P.S. cargo: Abbr. — 2004-04-01
- P.O. boxful — 2002-03-10
- G.P.O. items — 1997-12-07
- P.O. items — 1997-12-06