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Mycorrhiza Deficiency

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These photographs were taken by James M. Trappe as an employee of the USDA Forest Service, Pacific Northwest Research Station.  As such they are in the public domain and available for use without charge in any forum or format.  If used in publications, they should be attributed as follows:  U.S. Forest Service photo by James M. Trappe.  Attribution is unnecessary if they are used as illustrations accompanying oral presentations.

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