Description of the American electro magnetic telegraph : now in operation between the cities of Washington and Baltimore / by Alfred Vail.

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Description of the American electro magnetic telegraph : now in operation between the cities of Washington and Baltimore / by Alfred Vail. Public Domain Mark. Source: Wellcome Collection.

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This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)