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Children's sleep : a series of studies on the influence of motion pictures ; normal age, sex, and seasonal variations in motility; experimental insomnia; the effects of coffee; and the visual flicker limens of children / Samuel Renshaw; Vernon L. Miller; Dorothy P. Marquis; Renshaw, Samuel, 1892-1981; New York : The Macmillan company, 1933; Author's copy.;""Includes bibliographical references (p. 223-238) and index""

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