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USGS Sediment Sampling at Henderson Beach State Park in Florida ca. 2010
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USGS Sediment Sampling at Henderson Beach State Pa...

USGS scientists installing a temperature sensor under a public boardwalk in Norris Geyser Basin, Yellowstone National Park ca. June 2010
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USGS scientists installing a temperature sensor un...

USGS worker collects a Hurricane Irene sample at the Mohawk River at Cohoes on August 29, 2010
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USGS worker collects a Hurricane Irene sample at t...

USGS scientists installing a temperature sensor under a public boardwalk in Norris Geyser Basin, Yellowstone National Park ca. 2010
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USGS scientists installing a temperature sensor un...

USGS Sediment Sampling at St. George Island State Park ca. 2010
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USGS Sediment Sampling at St. George Island State ...

USGS Sampling Site at Henderson Beach State Park ca. October 2010
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USGS Sampling Site at Henderson Beach State Park c...

The USGS Golden Geomagnetic crew in Barrow, Alaska ca. 2010
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The USGS Golden Geomagnetic crew in Barrow, Alaska...

USGS worker collecting water samples at Sand Harbor, Lake Tahoe ca. 2010
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USGS worker collecting water samples at Sand Harbo...

In this photo, taken in August 1905, we see a USGS topographic leveling party, headed by R.A. Farmer on the slopes of Mount Whitney, California
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In this photo, taken in August 1905, we see a USGS...

Hydrologic Engineer Loaded with Field Equipment ca. 1920
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Hydrologic Engineer Loaded with Field Equipment ca...