ONYX PILLARS IN THE MAMMOTH CAVE OF KENTUCKY - NEW ENTRANCE. (Printed verso reads: "The Onyx Pillars stand as sentinels guarding the passageway into the region known as the Onyx Colonnade. As glimpsed in the picture this region abounds in unnumbered Stalagmites and Stalactites ranging in size from the size of a quill to massive pillars, in one instance to a single pillar 22 feet in diameter. Brilliantly lighted - with electricity.") 2 copies
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- University of Kentucky