found: Genre terms : a thesaurus for use in rare book and special collections cataloging, via WWW, July 28, 2014(Correspondence Use Letters)
found: Art & architecture thesaurus online, July 28, 2014(commercial correspondence. Commercial or business intercourse engaged in by two or more parties. May be considered broadly to include letters and other forms of communication including electronic mail. BT correspondence)
found: Reitz, J.M. ODLIS : online dictionary for library and information science, July 28, 2014(correspondence: Letters, memoranda, notes, postcards, e-mail, and other written and addressed messages exchanged between two or more people, usually archived with the personal papers of the correspondents. Often used in preparing biographical and historical works, correspondence may be published separately or with other papers)
found: Thesaurus for graphic materials, via WWW, July 28, 2014(Correspondence. UF Letters; Mail. BT Communication. NT Email; Hate mail; Letters to Santa; Love letters; Telegrams; V-mail)
found: Görlach, M. An alphabetical list of English text types, in Text types and the history of English, c2004:p. 30 (business letter: letter in business following respective conventions)
found: LCSH(Commercial correspondence. UF Business correspondence; Business letters)
