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Paper cut-out pyramid, 10 cm x 10 cm x 10 cm, listing metric conversion information on each face covering units of length, mass or weight, area or surface, energy, volume and temperature. The bottom face lists metric symbols.
McCracken, J.
(2002),
NIST Metric Pyramid, Letter Circular, National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.LCIRC.1140
(Accessed October 4, 2023)