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Taking surface sediment measurements at Crissy Marsh in San Francisco, CA.

By Environmental Health Program
A woman collects soil samples in a field with the Golden Gate Bridge in San Francisco, CA, in the background.
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Detailed Description

USGS researcher Jennifer Agee taking surface sediment oxidation-reduction and pH measurements at Crissy Marsh, a vegetated saltmarsh near the Golden Gate Bridge (background) in San Francisco, CA. Photographer: L. Windham-Myers.

Sources/Usage

Public Domain.