HP-42S Owner's Manual - HP Calculator Literature
HP-42S
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HP-42S - Wikipedia
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Amazon.com : HP 42S RPN Scientific Calculator : Office Products
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Camera and Flash calculator for HP42S, DM42 and Plus42
Eddie's Math and Calculator Blog: HP 42S Programming Part II: Dew Point, Ellipse Area and Eccentricity, Easy Transverse
HP-42S - Wikipedia
HP 42s Programming Example 1 - YouTube
