This document provides information on formatting business letters and personal letters. It discusses the different parts of a letter including the return address, dateline, salutation, body, complimentary close, and signature. It explains the differences between a personal-business letter and a business letter. A personal-business letter uses a home address as the return address while a business letter uses letterhead. It also describes the block style format for letters and includes examples of letters formatted with open and mixed punctuation. Special notations that can be included are typist initials, enclosure notations, attachment notations, and copy notations.