This document discusses the optional parts of a business letter, including:
- Addressee notation which appears above the inside address for restricted letters.
- Attention line which directs a letter to a specific department.
- Subject line which informs the recipient of the letter's topic.
- Reference initials/stenographic reference which identify the sender and typist.
- Enclosure notation which indicates additional materials included.
- Copy notation which lists those receiving copies of the letter.
The document provides examples and guidelines for writing effective subject lines and using the optional parts of a business letter.