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Source:
Newsweek. Fall/Winter90, Vol. 116 Issue 10, p16. 4p. 2 Illustrations, 2 Diagrams, 1 Graph.
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Source:
British Educational Research Journal. Mar1990, Vol. 16 Issue 1, p53. 8p.
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Source:
Journal of Instructional Psychology. Dec90, Vol. 17 Issue 4, p222. 9p. 4 Charts.
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Source:
Journal of Instructional Psychology. Mar90, Vol. 17 Issue 1, p33. 5p.
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Source:
Education. Winter90, Vol. 111 Issue 2, p275-296. 22p. 1 Diagram, 2 Charts, 15 Graphs.
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Source:
American Heritage. Dec90, Vol. 41 Issue 8, p76. 7p. 5 Illustrations.
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Source:
TIME Magazine. 6/4/1990, Vol. 135 Issue 23, p83. 2p. 2 Color Photographs, 1 Chart.
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Source:
TIME Magazine. 2/5/1990, Vol. 135 Issue 6, p78. 2p.
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Source:
Science Activities. Summer90, Vol. 27 Issue 2, p26. 3p.
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Source:
Science Activities. Summer90, Vol. 27 Issue 2, p24. 3p. 2 Charts.
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