File:Vintage Texas Instruments TI-30 Pocket Calculator, Red LED, Made in USA, A Very Widely Used Calculator, Price Was $24.95 in 1976 (8732557514).jpg - Wikimedia Commons
Texas Instruments TI-35 Handheld Electronic Calculator | National Museum of American History
Texas Instruments TI-35 II | IT History Society
Eddie's Math and Calculator Blog: Retro Review: Texas Instruments TI-35 PLUS