Eddie's Math and Calculator Blog: Retro Review: Hewlett Packard HP 20S and 21S
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File:HP 20S Scientific calculator, front, power on, display shows square root of 88, on blue background (35343601672).jpg - Wikimedia Commons
HP-20S Owner's Manual
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HP 20S Programming Overview - YouTube
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MyCalcDB : Calculator Hewlett-Packard 20S aka Pioneer ERNI
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Hewlett Packard Calculator HP 20S Scientific desk 1987 USA Indonesia - Vintage Man Stuff
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