| 41. | Tonight Mammoth Cave got a new voice.
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| 42. | The Mammoth Cave and its underground rivers.
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| 43. | You love Mammoth Cave-- you're changed ."
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| 44. | K�mper returned to Berlin, and from the point of view of the Mammoth Cave country, disappeared entirely.
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| 45. | Later he crossed the Allegheny Mountains, visiting the Mammoth Cave and other localities, and then traversed Canada.
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| 46. | Crystal Cave is now part of the Flint Ridge Cave System of the Mammoth Cave National Park.
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| 47. | At Harvard, McCombs studied with Nobel laureate Seamus Heaney, who encouraged him in his exploration of Mammoth Cave.
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| 48. | In 1941, Mammoth Cave National Park was established, and the two upper locks and dams closed in 1950.
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| 49. | Ecological restoration of this portion of Mammoth Cave, and facilitating the return of bats, is an ongoing effort.
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| 50. | Notable scientists who studied Mammoth Cave during this period include Patty Jo Watson ( see section on prehistory .)
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