This is the rulebook only from the third edition BattleTech boxed set. It is
missing it's covers.
From the back cover (missing);"IN THE 31st CENTURY, LIFE IS CHEAP, BUT
A Dark Age has befallen mankind. Where the United Star League once reigned,
five successor states now battle for control. War has ravaged the once
flourishing Star League worlds and left them in ruins. Technological
advancement has not only ceased, but the machines and equipment of the past
cannot be produced by present-day worlds. The Succession Wars are fought over
water, ancient machines, and spare parts factories. Control of these elements
will lead to final victory and the domination of known space."