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In page Mammoth Cave National Park:
"In the early 1920s, George Morrison created, via blasting, a number of entrances to Mammoth Cave on land not owned by the Croghan Estate. Absent the data from the Croghan's secretive surveys, performed by Kämper, Bishop, and others, which had not been published in a form suitable for determining the geographic extent of the cave, it was now conclusively shown that the Croghans had been for years exhibiting portions of Mammoth Cave which were not under land they owned. Lawsuits were filed and, for a time, different entrances to the cave were operated in direct competition with each other.[citation needed]
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