Joseph Bancroft & Sons Company began operation in 1831 as a cotton cloth manufacturer in Rockford, Delaware. After the American Civil War, the company concentrated on finishing cotton cloth, purchasing the Kentmere Mills adjoining their original site in 1895 and a third plant for manufacturing at Reading, Pennsylvania, in 1910. The company acquired another textile firm, the Eddystone Manufacturing Company, in 1925. This collection comprises records from both the Joseph Bancroft & Sons Company and the Eddystone Manufacturing Company, along with records from several predecessors and subsidiaries. The Joseph Bancroft & Sons Company records trace the firm's history from 1831 through 1961, with the Managing Director's letter books, in particular, giving a very detailed picture of the company's operations. The records of the Eddystone Manufacturing Company and its predecessors are relatively complete and offer a good picture of a medium-sized textile firm that was typical of the mid-Atlantic states.