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Source:
Child Development. Dec1990, Vol. 61 Issue 6, p1796. 12p. 4 Graphs.
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Source:
Applied Cognitive Psychology. Sep/Oct90, Vol. 4 Issue 5, p371-381. 11p.
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Source:
Science News. 12/15/90, Vol. 138 Issue 24, p375-375. 1/2p.
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