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HP 39/40 series - Wikipedia
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HP 39/40 series - Wikiwand
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Eddie's Math and Calculator Blog: Retro Review: HP 40gs
HP 40GS Graphing Calculator
Eddie's Math and Calculator Blog: Retro Review: HP 40gs
HP 39/40 series - Wikipedia
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HP 39&40 series - CALCVERSE
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HP 39/40 series - Wikiwand
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