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Source:
Chemical Week. 12/10/1997, Vol. 159 Issue 47, p19. 1/3p.
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Source:
Chemical Week. 7/16/1997, Vol. 159 Issue 27, p14. 1/4p.
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Source:
Chemical Week. 2/5/1997, Vol. 159 Issue 5, p54. 1/4p.
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Source:
Science. 12/5/1997, Vol. 278 Issue 5344, p1699-1699. 1/4p.
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Source:
Organic Gardening (08973792). May/Jun97, Vol. 44 Issue 5, p16. 2p. 1 Color Photograph.
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Source:
Social Alternatives. Jan97, Vol. 16 Issue 1, p20-22. 3p. 1 Black and White Photograph.
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