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Game preferences of 10,000 fourth grade childrenSchwendener, Norma, January 1932 (has links)
Thesis (Ph. D.)--Columbia University, 1932. / Bibliography: p. 46-49.
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Level of challenge and task persistence : a study of children in a cognitive activity /Kumar, Arati, January 1991 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaves 27-30). Also available via the Internet.
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