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IBM Thinkpad T61 RAM Replacement - iFixit Repair Guide
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First Impressions: Lenovo's new 14 inch T61 and R61 Thinkpads
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2GB Memory RAM Upgrade for the Lenovo Thinkpad R61 Series, T60 Series, T61 Series, X60 Series and X61 Series Laptops (DDR2-667, PC2-5300, SODIMM) at Amazon.com
IBM Thinkpad T61 RAM Replacement - iFixit Repair Guide
2GB [1x2GB] RAM Memory Upgrade for the IBM Lenovo Thinkpad R61 and R61i Laptops | eBay
Lenovo Thinkpad R61 RAM-Memory (2 Gig) | Replacement Part