Del Solar, Charlotte Fehlman 1918- creator Senn, Milton J. E. 1902- Yale University Child Study Center. text dcu Washington] 1950 monographic eng

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vi, 46 p. 27 cm. [by] Charlotte Del Solar ... [and] Milton J. E. Senn ... Child Study Center, Yale University, New Haven, Conn., in collaboration with the Federal Security Agency, Social Security Administration, Children's Bureau. Child psychology Child psychology Bibliography Z5814.C5 D4 ss 50000030 DLC 820127 20260227112751.0 ss 50000030