LENOVO THINKPAD R61 Intel Core 2 Duo 3GB RAM 160GB HDD WIFI LINUX MINT | eBay
IBM Thinkpad T61 RAM Replacement - iFixit Repair Guide
IBM Thinkpad T61 RAM Replacement - iFixit Repair Guide
Lenovo Thinkpad R61 RAM-Memory (1 Gig) | Replacement Part
2GB RAM Memory for Lenovo ThinkPad R61 7650 Black Diamond Memory Module DDR2 SO-DIMM 200pin PC2-5300 667MHz Upgrade System Specific Memory - Newegg.com
2GB 2X1GB Memory RAM for Lenovo ThinkPad R61 Series DDR2 SO-DIMM 200pin PC2-5300 667MHz Black Diamond Memory Module Upgrade System Specific Memory - Newegg.com