The HP 65 Programmable Pocket Calculator - HP History
HP-65
Hewlett-Packard HP-65 Handheld Electronic Calculator
National Museum of American History
Programming Handheld Calculators
HP-65 - Wikipedia
HP Virtual Museum: Hewlett-Packard-65 programmable pocket calculator, 1974
Hewlett-Packard Calculator Archives - HP History
The Magnet 22: Moon Rocket Landing game on a 1974 pocket calculator
HP 33S Scientific Calculator (F2216A),Grey : Office Products
Hewlett Packard HP-35
The Hewlett-Packard 65, the first pocket programmable calculator, and it's successor(s), the Hewlett-Packard 67 and Hewlett-Packard 97. : r/calculators
HP Virtual Museum: Hewlett-Packard-65 programmable pocket calculator, 1974
Stacks, 'Pacs', and User Hacks: A Handheld History of Personal Computing (Chapter 14) - The Whipple Museum of the History of Science
HNF - Desk and pocket calculators – Electronic mass products
