Duffield, U. G., Sproul, W. C. 1., Ashmead, H. G., & Roach, M. Souvenir of Roach's shipyard, the Delaware River Iron Shipbuilding and Engine Works, Chester, Pa. Philadelphia: Franklin Printing Co., [1896, c1895].

Duffield, Ulysses Grant., William C. 1870-1928 Sproul, Henry Graham Ashmead, and Mary Roach. Souvenir of Roach's Shipyard, the Delaware River Iron Shipbuilding and Engine Works, Chester, Pa. Philadelphia: Franklin Printing Co., [1896, c1895].

Duffield, Ulysses Grant., William C. 1870-1928 Sproul, Henry Graham Ashmead, and Mary Roach. Souvenir of Roach's Shipyard, the Delaware River Iron Shipbuilding and Engine Works, Chester, Pa. Philadelphia: Franklin Printing Co., [1896, c1895].