Related Clues:
- Bottom-of-letter abbr
- SASE, perhaps: Abbr
- Ltr. in an envelope
- Something besides the letter: Abbr
- ''Britannica,'' for one: Abbr
- Envelope insert: Abbr
- Wedding RSVP card, e.g
- Britannica, e.g.: Abbr
- Multi-vol. reference
- Bottom-of-letter letters
- RSVP card, e.g
- Envelope insert (Abbr.)
- Ltr. insertion
- Abbr. at the bottom of an application
- Like many cks