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Elements Handbook

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The Periodic Table

Elements by Name

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Elements by Atomic Number

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Numerari from KnowledgeDoor---The scientific calculator with graphing, unit keypads, complex numbers, constants, advanced functions, user-defined keys, quick copy, and more! Learn more (Link leaves KnowledgeDoor website)

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Heaven's Boulevard astronomical sky image for any location, date, and time. Personalize with a picture and message. Great gift for birthdays, anniversaries, or any special event. Learn
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Units and Constants Handbook