Related Clues:
- Massive ref. bk
- The 'definitive record of the English language'
- Etymologist's ref
- Multivolume ref
- S.A.S.E., for one
- Env. addition
- UK reference set
- It has around 600,000 defs
- British ref. for wordsmiths
- Shelf-filling ref. work
- End-of-letter abbr
- Twenty-volume ref. work
- Book that tells you the meaning of 'life': Abbr
- 20-volume ref. set
- Business letter abbr