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United States Department of Agriculture

Agricultural Research Service

Image Number D1533-6

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 Image Number D1533-6

Soil scientist Ardell Halvorson (foreground) and technician Mary Smith prepare field samples for gas chromatograph analysis of carbon dioxide and methane.


Photo by Stephen Ausmus.

640 pixels wide: (d1533-6.jpg)

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Last Modified: 1/29/2014
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