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Enlace: http://lcweb2.loc.gov/ammem/bellhtml/bellhome.html

Descripción: Library of Congress.
«The online version of the Alexander Graham Bell Family Papers at the Library of Congress comprises a selection of 4,695 items (totaling about 51,500 images). This presentation contains correspondence, scientific notebooks, journals, blueprints, articles, and photographs documenting Bell's invention of the telephone and his involvement in the first telephone company, his family life, his interest in the education of the deaf, and his aeronautical and other scientific research. Dates span from 1862 to 1939, but the bulk of the materials are from 1865 to 1920.»