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MacBook Pro: How to remove or install memory - Apple Support
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
Macbook Pro Mid 2009 Ram for sale | eBay
8GB RAM upgrade for mid-late 2009 Macbook Pro | MacRumors Forums
upgrade - Upgrading MacBook Pro mid-2009 RAM - Ask Different
upgrade - Upgrading MacBook Pro mid-2009 RAM - Ask Different
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com