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Source:
New Scientist. 12/8/90, Vol. 128 Issue 1746, p37. 5p. 3 Color Photographs, 1 Black and White Photograph, 4 Graphs.
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Source:
Public Health Reports. Sep/Oct90, Vol. 105 Issue 5, p463. 8p. 6 Charts.
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Source:
BMJ: British Medical Journal (International Edition). 9/1/90, Vol. 301 Issue 6749, p412. 4p. 6 Charts.
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Source:
American Spectator. Jul90, Vol. 23 Issue 7, p32. 2p. 1 Illustration.
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