Related Clues:
- Something besides the ltr.
- Abbr. on a business letter, perhaps
- Mailed doc.
- RSVP card, e.g.
- Business letter letters
- Ltr. add-in
- Letter-ending abbr.
- In the env.
- Something in a ltr.
- It's inside: Abbr.
- Business-letter abbr.
- It may be a copy of a ck.
- Cover letter letters
- Letter add-on (Abbr.)
- Doc. with a ltr.