Lewis, H. B. (1926). The Welsh Society of Philadelphia: An account of the early settlement of the Welsh in Philadelphia and its vicinity, and of the formation and organization of the Welsh Society. Philadelphia: [s.n.].

Lewis, Howard Benton. The Welsh Society of Philadelphia: An Account of the Early Settlement of the Welsh in Philadelphia and Its Vicinity, and of the Formation and Organization of the Welsh Society. Philadelphia: [s.n.], 1926.

Lewis, Howard Benton. The Welsh Society of Philadelphia: An Account of the Early Settlement of the Welsh in Philadelphia and Its Vicinity, and of the Formation and Organization of the Welsh Society. Philadelphia: [s.n.], 1926.