HP-28C/S

HP-28S Owners Manual

HP calculators - Wikipedia

Everbilt Submersible Utility Pump SUP54-HD 1/6 HP 28 GPM. Ex. Cond. Reduced Ship – Contino

HP 28S Advance Scientific Calculator # 705 – Casio 880

2290, 1/17 Hp, 28 Rpm, 60:1, 37 Lb-in., 30R4BEPP-3N, 230 Vac., Right

HP Calculator Self-Test Functions

Remanufactured Ink Cartridge for HP 28 (C8728AN) Color

EBS HP-28 High Performance Flat Patch Cable 28cm (11.02)

The HP 28S programmable calculator

PDF) The HP-28S, calculus, and programming