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7Published 2011Subjects “...Play Psychological aspects Handbooks, manuals, etc....”
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8by Erikson, Erik H. (Erik Homburger), 1902-1994Subjects “...Developmental psychology....”
Published 1977
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13Children's special places : exploring the role of forts, dens, and bush houses in middle childhood /by Sobel, David, 1949-Subjects “...Play Psychological aspects....”
Published 2002
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16by Gulick, Luther Halsey, 1865-1918Subjects “...Play Psychological aspects....”
Published 1972
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18Published 2004Subjects “...Play Psychological aspects....”
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