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An Attempt at Restoring a HP 42S : r/calculators
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Step-By-Step Anachronometric Solutions for Your DM42/Free42/HP-42S Calculator | Dig a Thousand Holes Publishing
HP-42S Scientific Calculator
Eddie's Math and Calculator Blog: HP 42S Programming Part II: Dew Point, Ellipse Area and Eccentricity, Easy Transverse
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HP 42S Scientific Calculator from 1988 - YouTube
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An Attempt at Restoring a HP 42S : r/calculators
