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Source:
Newsweek. 7/22/1991, Vol. 118 Issue 4, p1/8. 8p. 1 Color Photograph.
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Source:
Environment. Jul/Aug91, Vol. 33 Issue 6, p10-39. 11p. 3 Black and White Photographs, 1 Illustration, 2 Charts.
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Source:
Science Activities. Spring91, Vol. 28 Issue 1, p16. 3p. 1 Graph.
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Source:
TIME Magazine. 5/20/1991, Vol. 137 Issue 20, p47. 1/5p. 1 Color Photograph.
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Engineer. Jul91, Vol. 21 Issue 3, p14. 4p. 3 Black and White Photographs, 2 Diagrams.
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Common Cause Magazine. May/Jun91, Vol. 17 Issue 3, p7. 2p. 1 Color Photograph.
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Source:
Environment. Nov91, Vol. 33 Issue 9, p5-45. 4p. 1 Black and White Photograph.
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Environment. Jun91, Vol. 33 Issue 5, p21-21. 1/3p. 1 Illustration, 1 Cartoon or Caricature.
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Source:
National Wildlife. Aug/Sep91, Vol. 29 Issue 5, p4. 6p. 5 Color Photographs, 1 Illustration.
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