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 Image Number K7243-7 |
In the mid 1950s, ARS scientists discovered DEET. Though it is still the
main active ingredient in about 200 commercial products, new insect repellents
are being researched today.
Photo by Scott Bauer.
640 pixels wide: (k7243-7.jpg)
Please visit our Image Gallery
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Last Modified: 05/23/2006
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