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Hollerith Punch Card for Use in the Baltimore Census of Mortality

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. By the late 19th century, the U.S.
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Gang Punch Made by the British Tabulating Machine Company

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. In the 1880s American engineer Herman ...