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PowerBook G4 - Wikipedia
All Apple PowerBook G4 Specs (2001-2006): EveryMac.com
Apple PowerBook G4 1.5 12" (Al) Specs - EveryMac.com
PowerBook G4 Manuals and Downloads - Apple Support
Apple PowerBook G4 1.67 15" (Al) Specs - EveryMac.com
Apple Unveils One Inch Thick Titanium PowerBook G4
PowerBook G4 (12-inch 1.5GHZ) Manuals and Downloads - Apple Support
PowerBook G4 (12-inch 1.33GHZ) - Apple Support
Apple PowerBook G4 (17-inch) review: Apple PowerBook G4 (17-inch)
Apple PowerBook G4 1.67 15" (DLSD/HR - Al) Specs