Growth in private school children : with averages and variabilities based on 3,110 measurings on boys, and 1,473 on girls, from the ages of one to nineteen years / Horace Gray and J.G. Ayres.

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Ayres, J. G. (James Garrett), 1899-

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Growth in private school children : with averages and variabilities based on 3,110 measurings on boys, and 1,473 on girls, from the ages of one to nineteen years / Horace Gray and J.G. Ayres.