Free ThrowBackThursday photos
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gold rush, prospector, gold-bearing quartz, Alaska, mining, geology, minerals, Seward Bonanza Gold Mines, Alaska Northern Railway, TBT, ThrowBackThursday
Public Domain
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Carlsbad Caverns, 1923, Shinav's Wigwam, stalactites, historical, geology, cave, New Mexico, ThrowBackThursday, USGS, rocks
Public Domain
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buffalo, Yellowstone National Park, historical, Frank Island, cabin, roaming, close-up, USGS, science, ThrowBackThursday, animals
Public Domain
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Leaning Tower, Rock, St. Peter Sandstone, Footville, Wisconsin, geology, glacial weathering, black and white, historic photo, USGS, ThrowBackThursday
Public Domain
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Apollo 17, geologic exercise, Tonopah Nevada, John Young, Charles Duke, Grover vehicle, USGS Astrogeology, NASA photo, ThrowBackThursday, Project Apollo, black and white
Public Domain
