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Source:
Science. 12/4/1998, Vol. 282 Issue 5395, p1830-1831. 2p. 1 Chart.
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Source:
Phi Delta Kappan. Jun98, Vol. 79 Issue 10, p769. 4p.
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Source:
Science. 4/17/1998, Vol. 280 Issue 5362, p385-385. 1/4p.
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Source:
Phi Delta Kappan. Sep98, Vol. 80 Issue 1, p32. 5p. 2 Black and White Photographs, 2 Charts.
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Source:
Education Digest. Oct98, Vol. 64 Issue 2, p19. 4p.
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Source:
Phi Delta Kappan. Sep98, Vol. 80 Issue 1, p36. 3p. 1 Black and White Photograph.
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Source:
Phi Delta Kappan. Jun98, Vol. 79 Issue 10, p793. 2p. 1 Color Photograph.
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Source:
Phi Delta Kappan. May98, Vol. 79 Issue 9, p686. 2p.
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Source:
Teaching Pre K-8. Jan98, Vol. 28 Issue 4, p54. 2p.
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Source:
Education Week. 02/18/98, Vol. 17 Issue 23, p6. 1/2p. 1 Black and White Photograph.
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