: 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 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)
The most detailed community-created "papers" (comprehensive text files) are available on specialized gaming sites: Armored Core 10 Works Complete File