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U.S. Center for Educational Apparatus. Nature 198, 1144–1145 (1963). https://doi.org/10.1038/1981144e0
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DOI: https://doi.org/10.1038/1981144e0
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U.S. Center for Educational Apparatus. Nature 198, 1144–1145 (1963). https://doi.org/10.1038/1981144e0
Issue Date:
DOI: https://doi.org/10.1038/1981144e0
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