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Transwiki approved by: w:en:User:Dmcdevit

This image was copied from wikipedia:en. The original description was:

Summary

U.S Environmental Protection Agency in collaboration with North Carolina State University (NCSU)

Licensing

	This image (or other media) is a work of an Environmental Protection Agency employee, taken or made as part of that person's official duties. As works of the U.S. federal government, all EPA images are in the public domain.
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