• Abbr. at the bottom of a business letter
• Accompaniers of cover letters: Abbr.
• Business ltr. add-ins
• Env. add-ins
• Env. additions
• Env. contents
• Env. extras
• Env. fillers
• Envelope extras: Abbr.
• Extra things in the env.
• Items incl. with a letter
• Items included in envs.
• Letter attachments: Abbr.
• Letter-bottom abbr.
• Ltr. add-ins
• Ltr. additions
• Ltr. attachments
• Ltr. extras
• Ltr.-bottom notation
• Ref. books
• SASEs, e.g.
• SASEs, for instance
• SASEs, perhaps
• Some refs.
• They accompany letters: Abbr.
• They're inserted into envs.
• Writing samples with a c.v., perhaps: Abbr.