Royalty free Throw Back Thursday photos

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Mount St. Helens, volcano, ash, geologist, trench, Coldwater Ridge, eruption, Washington, historical, USGS, Throw Back Thursday

Public Domain
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USGS, Throw Back Thursday, snow, snowman, Olaf, geologist, geology, Mount St. Helens, 1983 eruption, Frosted Flakes Expedition, Lyn Topinka

Public Domain
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Kansas, statehood, mushroom rock, geology, history, historical, Pulpit rock, Ellsworth County, Dakota sandstone, Throw Back Thursday, USGS

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USGS, NASA, Moon, space exploration, LRV, rover, lunar, Apollo, Throw Back Thursday, TBT, geologic training

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USGS, TBT, Throw Back Thursday, National Park, Natural Bridges, Utah, horse, black and white, Owachomo Bridge, Dan Perkins, Cap

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Datatron 205, computer, NASA, USGS, technology, historical, Moon, Apollo, Throw Back Thursday, geology, Arizona

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USGS, science, historical, water, streamgaging, river, stream, history, TBT, Throw Back Thursday, 1890

Public Domain