Periodic table designed in the style of a pyramid by Charles E. Gragg. This table was published by Instruments for Research and Industry and includes instructions for assembly into a 3-D model.
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Gragg, Charles E. “The Periodic Pyramid.” Cheltenham (Township), Pennsylvania: Instruments for Research and Industry, 1983. Folder Flat File 2. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/5999n451j.
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