Topics in this series are widely varied, however they are all related to the daily operations of the Duke Farms estate. The materials begin with J.B. Duke, primarily documenting the early evolution of the estate from a "gentleman's" farm (raising and breeding cattle and horse) to a public park, and finally to a large-scale agricultural production farm to support the war effort. Materials include the original deeds, mortgages, and agreements relating to the formation of J.B. Duke's Hillsborough property, the certificate of incorporation of the Duke's Farm Company in 1917, correspondence and invoices for purchases of equipment and Jersey cows for the farm, lists of plants and flowers sold, analysis of profit and loss accounts, daily activity reports, and correspondence, notes, and specifications for various architectural projects at Duke Farms, including the construction of a "country house" and the greenhouses. Of particular interest are the letterbooks, which range from 1916 to 1927. The letters detail the daily operations of Duke's Farms, including the purchases of plants, trees, and flowers for the estate, rent paid, farm equipment requests, and letters to Horace Trumbauer regarding the construction of two cottages on the estate.