"The Giant Dome, Largest Stalagmite thus far Discovered, it…
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"The Giant Dome, Largest Stalagmite thus far Discovered, it is 16 Feet in Diameter and Estimated to be 60 Million Years Old, 'Hall of Giants, Big Room,' Carlsbad Caverns National Park," New Mexico (Vertical Orientation)
Credit: National Archives, Records of the National Park Service (Record Group 79), 79-AAW-6. Public domain (U.S. federal record). National Archives: access unrestricted, use unrestricted.
