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USGS scientist sampling Ear Spring, Yellowstone National Park, Wyoming

By Environmental Health Program 2007 (approx.)
USGS scientist sampling Ear Spring, Yellowstone National Park, Wyoming, for dissolved mercury species.
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Detailed Description

USGS scientist sampling Ear Spring, Yellowstone National Park, Wyoming, for dissolved mercury species. Old Faithful is erupting in the background.

Sources/Usage

Public Domain.