The Origins of Sound Recording - Thomas Edison National Historical Park (U.S. National Park Service)

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Origins of Sound Recording: Edison's Path to the Phonograph - Thomas Edison National Historical Park (U.S. National Park Service)

Origins of Sound Recording: Thomas Edison - Thomas Edison National Historical Park (U.S. National Park Service)

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Origins of Sound Recording: Thomas Edison - Thomas Edison National Historical Park (U.S. National Park Service)

National Park Service History Electronic Library & Archive