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
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 Thinkpad T61 RAM-Memory (2 Gig) | Replacement Part
Computer Memory Solutions RNAB00EUFQYWY cms 2gb (1x2gb) ddr2 5300 667mhz non ecc sodimm memory ram upgrade compatible with ibm lenovo thinkpad t61, t61p series - a38