From publisher blurb:

Rifts Sourcebook One, Revised and Expanded will surprise and delight Rifts fans. The new ideas, new vehicles, and new art are going to blow people away, especially the new A.R.C.H.I.E. Three and Republican material.

• More of A.R.C.H.I.E. Three's history is revealed (and hints about his future), the Republicans (throwbacks to NEMA and Chaos Earth) are revealed at last, and . . . well, check it out and see for yourself.
• Includes never-before-revealed information on A.R.C.H.I.E. Three and for the first time ever - The Republicans and their link to A.R.C.H.I.E. Three.
• Robot creation rules.
• New and old weapons, power armor & equipment.
• Triax weapons & power armor.
• A.R.C.H.I.E. Three, Hagan Lonovich and robotic minions.
• The Republicans revealed at last and their secret war with A.R.C.H.I.E. 3.
• Notable monsters, adventures, and new adventure ideas.