The Four Years War (1986)

This sourcebook was bundled with the adventure "Return to Axanar".

From the book description:

"[This book] details The Four Years War. Essays by Federation experts on Axanar, the major battles, and the political, social, and economic factors are indluded."

From inside the book:

"THE FOUR YEARS WAR

A Concise Compilation of Library Information on the Conflict Between the United Federation of Planets and the Klingon Empire, stardates 1/9409 through 1/9806."

A supplement for use with STAR TREK: The Role Playing Game."