Related Clues:

• Check included with a ltr., e.g
• Bus. letter notation
• S.A.S.E., for one
• Env. addition
• End-of-letter abbr
• Business letter abbr
• Insert of a sort: Abbr
• Britannica, for one: Abbr
• Env. stuffing
• S.A.S.E., e.g.: Abbr
• Pkg. insert
• Letter abbr
• Cause of an env. bulge
• Ltr.-bottom letters
• Ref. wk