A technique for studying the social-material activities of young children /
Barker, Margaret,1897-
Columbia University.Teachers College.Child Development Institute.
New York : Teachers College, Columbia University,
c1930.
Issued also as thesis (Ph.D) Columbia University.
"The children observed, two to three years of age, attended the nursery school of the Child Development Institute."
Includes bibliographical references.
Child development.
Child psychology.