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Miner of solfara vodi wearing a gas mask, assoro, sicily, 70s
UMG23A14_134

Miner of solfara vodi wearing a gas mask, assoro, ...

Sulfur-salt pool.
UMG23A02_343

Sulfur-salt pool.

United States of America
UMG22A44_380

United States of America

1981 - Gas Sampling around the Mount St. Helens Dome
UMG22A39_247

1981 - Gas Sampling around the Mount St. Helens Do...

Monitoring Gas Emissions from Kilauea Volcano ca. 2010
UMG22A33_110

Monitoring Gas Emissions from Kilauea Volcano ca. ...

Sulfur Springs, Virginia (vicinity). Bridge over the north fork of the Rappahannock River 1865
UMG20A71_196

Sulfur Springs, Virginia (vicinity). Bridge over t...