IBM Thinkpad T61 RAM Replacement - iFixit Repair Guide
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
LENOVO THINKPAD R61 Intel Core 2 Duo 3GB RAM 160GB HDD WIFI LINUX MINT | eBay
Lenovo Thinkpad R61 RAM-Memory (1 Gig) | Replacement Part
Refurbished Lenovo ThinkPad R61 Laptop Core 2 Duo 2 Gb Ram 160Gb HDD Windows 7
LENOVO THINKPAD R61 Intel Core 2 Duo 3GB RAM 160GB HDD WIFI LINUX MINT | eBay