The Origins of Logic (Six to Twelve Months).
By Jonas Langer, Pp.437. (Academic: New York and London, 1979.) $26.50, £15.
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Bryant, P. Protologic. Nature 285, 56 (1980). https://doi.org/10.1038/285056b0
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DOI: https://doi.org/10.1038/285056b0