Appalachian Trail's rocky Pennsylvania stretch grueling for hikers

The Appalachian Trail keeps getting longer, harder. See the A.T.'s

Appalachian Trail in Pennsylvania

Appalachian Trail's rocky Pennsylvania stretch grueling for hikers

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Appalachian Trail's rocky Pennsylvania stretch grueling for hikers

48-Year-Old Karl Meltzer Shatters Appalachian Trail Record

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Pennsylvania Girl Gone Hiking

The Geology of the Appalachian Trail - Dr. Bruce L. Hartman

Middletown NJ man with rheumatoid arthritis hikes Appalachian Trail