Last seen in:
Related Clues:
- SASE, perhaps: Abbr
- Ltr. in an envelope
- Second afterthought, in a ltr
- Second addendum to a letter (Abbr.)
- ''Britannica,'' for one: Abbr
- Second afterthought and this puzzle's theme
- Ltr.'s second add-on
- Envelope insert: Abbr
- Wedding RSVP card, e.g
- Additional afterthought, for short
- Second afterthought: Abbr
- Second afterthought on a ltr
- Britannica, e.g.: Abbr
- Multi-vol. reference
- RSVP card, e.g