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State Home Road, Clinton township, PA 17752
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Dauphin County
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Travel and tourism services in Londonderry township, Dauphin County
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Three Mile Island Observation Center
- Constellation Energy - private access
River Road, 3140 17057 Middletown
Former visitors center for the Three Mile Island power plant, which later became an observation center and training facility for employees. Closed to the public since 1979.