Related Clues:
- Ref. work chronicled in "The Professor and the Madman"
- Respected ref. book
- Doc. with a ltr.
- Shak. is its most-quoted writer
- Brit. word book
- Brit. word authority
- UK multi-volume ref. work
- Multi-volume ref. work
- Cover-letter letters
- Something inside an envelope: Abbr.
- Multi-vol. Brit. ref.
- Compton's, for one: Abbr.
- 20-vol. lexicon
- Subject of the book 'The Meaning of Everything,' briefly
- Lexicon for a don