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Backcountry travel in Grand Canyon to collect groundwater samples

February 2018 (approx.)

Detailed Description

USGS scientist Joel Unema hikes to National Canyon Spring to collect groundwater samples from a remote location near the south rim of the Grand Canyon. Joel Unema was part of a group of USGS and National Park Service scientists that rafted 150 miles in nine days to better understand natural resources.


Public Domain.