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Source:
Smithsonian. Oct91, Vol. 22 Issue 7, p138. 9p. 12 Color Photographs.
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Source:
Organic Gardening (08973792). Dec91, Vol. 38 Issue 9, p26. 6p. 8 Color Photographs, 1 Graph.
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Source:
New Phytologist. May91, Vol. 118 Issue 1, p101-109. 9p.
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Source:
Ebony. Sep1991, Vol. 46 Issue 11, p44-51. 6p. 4 Color Photographs.
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Source:
Prevention. Aug91, Vol. 43 Issue 8, p80. 2p. 6 Illustrations.
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Source:
Prevention. Feb91, Vol. 43 Issue 2, p97-97. 1p. 3 Color Photographs, 3 Illustrations.
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Source:
Journal of Phytopathology. Nov1991, Vol. 133 Issue 3, p216-224. 9p.
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Source:
Journal of Phytopathology. Jul1991, Vol. 132 Issue 3, p219-229. 11p.
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Source:
Journal of Phytopathology. Jun1991, Vol. 132 Issue 2, p146-152. 7p.
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Source:
Journal of Phytopathology. Mar1991, Vol. 131 Issue 3, p243-252. 10p.
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