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Backcountry travel in Grand Canyon to collect groundwater samples

By Communications and Publishing February 2018 (approx.)
USGS scientists warm up in the sun as the scientific expedition moves downstream to the next sample location.
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Detailed Description

USGS scientists Tom Porter and Joel Unema warm up in the sun as the scientific expedition moves downstream to the next sample location.

The group of USGS and National Park Service scientists rafted about 150 miles in nine days on the Grand Canyon portion of the Colorado River to collect groundwater samples from springs in remote locations. 

Sources/Usage

Public Domain.