Abstract Inventor and businessman. Correspondence, diary, financial and business papers, patents by Hollerith and others, blueprints, drawings, a Hollerith machine punch plate, writings about Hollerith by Geoffrey Austrian and others, biographical material, and other papers relating to Hollerith tabulating machines and their use in census taking (1890-1910), operation of Tabulating Machine Company and its merger with two other companies forming Computer-Tabulating-Recording Company (1911), and...

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United States Army officer, engineer, and ordnance expert. Correspondence, travel and other diaries and journals, and miscellaneous papers of Mordecai and his family.

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Diplomat and secretary of the United States legation in Mexico. Correspondence, journals, clippings, and other papers relating primarily to Plumb’s negotiations relating to the Mexican railway system.

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Bound volumes of files kept by the Jesuits, original owners of the hacienda. Subjects include the acquisition and sale of land, ownership disputes, water rights, rental of property, agricultural production, livestock and livestock brands, and relations with the Indigenous people of Mexico. Also includes correspondence and fiscal accounts with the local railroad company.