Related Clues:
- Bus. ltr. insert
- Britannica ref
- In the envelope: Abbr
- Ref. book set
- Letter-bottom abbr
- [There's another doc]
- Anything in an env
- Abbr. at the bottom of some applications
- Anything inside an envelope: Abbr
- Bottom-of-business-letter notation
- Something in addition to the letter: Abbr
- Something extra in an env
- 25 Across, for one: Abbr
- Something extra in an envelope: Abbr
- RSVP card, for example