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Related Clues:
- Letter abbr.
- Ref. work
- Bottom-of-letter abbr.
- Second afterthought, in brief
- Letters in a letter
- SASE, e.g.
- Dict. shelfmate
- Something in an env.
- Abbr. on a business letter
- Ltr. insert
- Second ltr. addition
- Stamped return env., e.g.
- Env. abbreviation
- Second letter addendum: Abbr.
- Collier's, for one: Abbr.