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Telephone line construction, switchboard house for new telephone system, 1939 Mammoth Cave National Park; National Park Service
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1939-09-12
Telephone line construction, switchboard house for new telephone system, 1939 Mammoth Cave National Park; National Park Service
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1940-09-12
Yellowstone photo album 30, page 26 Yellowstone National Park
Yellowstone photo album 24, page 96 Yellowstone National Park
Underground telephone line Blue Ridge Parkway Virginia, Section 1M.
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1982-01-07
Underground telephone line Blue Ridge Parkway Virginia, Section 1M.
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1982-01-07

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