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PowerBook G4 - Wikipedia
All Apple PowerBook G4 Specs (2001-2006): EveryMac.com
Power Mac G4 - Wikipedia
Apple PowerBook G4 1.67 15" (Al) Specs - EveryMac.com
Apple 15-inch PowerBook G4 review: Apple 15-inch PowerBook G4
iBook G4 (Early 2004) - Technical Specifications - Apple Support
Apple iBook G4/800 12-Inch (Original - Op) Specs - EveryMac.com
Apple PowerBook G4 (12-inch review: Apple PowerBook G4 (12-inch
Apple PowerBook G4 (17-inch; 1.67GHz) review: Apple PowerBook G4 ... - CNET
Apple Unveils One Inch Thick Titanium PowerBook G4