Lenovo ThinkPad Laptop R61 14.1" Core 2 Duo 2.1GHz 4GB Ram 250GB Windows 10 Home
Lenovo Thinkpad R61 RAM-Memory (1 Gig) | Replacement Part
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) - Walmart.com
Upgrading RAM in the ThinkPad R61 - YouTube
2GB [1x2GB] Memory RAM Upgrade for the Lenovo ThinkPad R61, R61e, R61i Laptops | eBay
IBM Thinkpad T61 RAM Replacement - iFixit Repair Guide