Related Clues:

• SASE, often
• U.K. reference bk.
• Letter-bottom abbr.
• Brit. reference
• An SASE is one
• Classic ref. work
• Competitor of Chambers, for short
• Env. in an env., say
• Where a Brit may find a def.
• Brit. resource for wordsmiths
• Env. insert
• Letter-bottom letters
• 130-lb.-plus ref.
• Big ref.
• 20-vol. work