From Wookieepedia, the Star Wars wiki.

The Star Wars Rules Companion
Attribution
Author(s)	Greg Gorden
Publication information
Publisher	West End Games
Publish date	January 1989
Type	Paperback
ISBN	0874311470

[Source]

The Star Wars Rules Companion is a paperback supplement to Star Wars: The Roleplaying Game published by West End Games. It was written by Greg Gorden and published in January 1989.

Publisher's summary

Expand your Star Wars campaign with this new roleplaying game supplement! The Star Wars Rules Companion incorporates the important changes and clarifications from The Star Wars Rules Upgrade, as well as new options suggested by you, the players, to create an even more exciting roleplaying experience.

The best roleplaying game of the year is now even better! These new and expanded rules increase the scope of the galaxy, clarify nagging questions, and further enhance the movie-like spirit of Star Wars: The Roleplaying Game.

Content

Introduction

New Rules and Revisions

• Chapter One: Attributes and Skills
• Chapter Two: Movement
• Chapter Three: Combat
• Chapter Four: Starships
• Chapter Five: Star Warriors Conversion
• Chapter Six: Droids and Equipment
• Chapter Seven: Capital Ship Combat

Color Section

The Force

• Chapter One: Force Rules
• Chapter Two: Revised Force Powers
• Chapter Three: New Force Powers

Adventure

• To Free the Forgotten

Ship Template and Chart

Index

Wookieepedia has a collection of images related to The Star Wars Rules Companion.