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Related Clues:
- Britannica, for one: Abbr
- Env. stuffing
- S.A.S.E., e.g.: Abbr
- Pkg. insert
- Ltr. extender
- Letter abbr
- Cause of an env. bulge
- Correspondent's "Oh, and another thing ..."
- Ltr.-bottom letters
- Second letter addendum: Abbr
- Ref. wk
- In the env
- Addl. afterthought
- After-afterthought on a letter: Abbr
- Bottom-of-letter abbr