Apple MacBook Pro 5.5 Mid 2009 13.3" A1278, Core 2 Duo, 240GB SSD, 8GB RAM | eBay
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Apple MacBook Pro 13.3" (Mid-2009) Core 2 Duo, 4GB RAM, 160GB HDD – Service Batt – ASA College: Florida
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
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Apple MacBook Pro Summer 2009 review: Apple MacBook Pro Summer 2009 - CNET
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Macbook Pro RAM 4GB (2 x 2GB) 2009 2010 2011 2012 A1278 A1286 13 15" DDR3 10600s | eBay
Review Apple MacBook Pro 13 Mid 2009 2.53 GHz - NotebookCheck.net Reviews