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In page Mammoth Cave National Park:
"Further connections between Mammoth Cave and smaller caves or cave systems have followed, notably to Proctor/Morrison Cave beneath nearby Joppa Ridge in 1979. Proctor Cave was discovered by Jonathan Doyle, a Union Army deserter during the Civil War, and was later owned by the Mammoth Cave Railroad, before being explored by the CRF. Morrison cave was discovered by George Morrison in the 1920s. This connection pushed the frontier of Mammoth exploration southeastward.[citation needed]
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