Armored Core 3 Link

If you are looking for physical or digitized professional guides, the following are the primary "paper" resources:

: A comprehensive Japanese book that includes official in-universe timelines and detailed structures of Armored Cores (ACs) for the first ten games, including Armored Core 3. Digital "Full Paper" Guides (Walkthroughs & Lists) Armored Core 3

: A 144-page English paperback written by Joe Grant Bell and published by Prima Games in September 2002. If you are looking for physical or digitized