Tutorial: How to upgrade ram in a T61 Thinkpad - YouTube
IBM Thinkpad T61 RAM Replacement - iFixit Repair Guide
8GB 2X4GB Compatible Memory for Lenovo Thinkpad T61 T61p DDR2 PC2-5300 SODIMM RAM (PARTS-QUICK Brand) at Amazon.com
My Decade Driver: a 2008 vintage Lenovo Thinkpad T61! New battery, SATA SSD, and RAM upgrade. A bit sluggish but it works! : r/retrobattlestations
Lenovo T61 laptop 14" Intel Core 2 Duo 2.0GHz 2GB RAM 160GB HDD WIFI LINUX | eBay
Change RAM in Lenovo T61 in one minute - YouTube
T61 - Wiki
4GB 2X2GB Memory RAM for Lenovo ThinkPad T Series T61 ( Type 7665 ) 200pin 667MHz PC2-5300 DDR2 SO-DIMM Black Diamond Memory Module Upgrade System Specific Memory - Newegg.com