Harper, R. G., Winchester, G., Coale, E. J., & Edes, B. (1824). Gen. Harper's speech, to the citizens of Baltimore: On the expediency of promoting a connexion between the Ohio, at Pittsburgh, and the waters of the Chesapeake, at Baltimore, by a canal through the District of Columbia : With his reply to some of the objections of Mr. Winchester : Delivered at a meeting, held at the Exchange, on the 20th day of December, 1823. Baltimore: Published by Edward J. Coale.

Harper, Robert Goodloe, George Winchester, Edward Johnson Coale, and Benjamin Edes. Gen. Harper's Speech, to the Citizens of Baltimore: On the Expediency of Promoting a Connexion between the Ohio, At Pittsburgh, and the Waters of the Chesapeake, At Baltimore, By a Canal Through the District of Columbia : With His Reply to Some of the Objections of Mr. Winchester : Delivered At a Meeting, Held At the Exchange, On the 20th Day of December, 1823. Baltimore: Published by Edward J. Coale, 1824.

Harper, Robert Goodloe, George Winchester, Edward Johnson Coale, and Benjamin Edes. Gen. Harper's Speech, to the Citizens of Baltimore: On the Expediency of Promoting a Connexion between the Ohio, At Pittsburgh, and the Waters of the Chesapeake, At Baltimore, By a Canal Through the District of Columbia : With His Reply to Some of the Objections of Mr. Winchester : Delivered At a Meeting, Held At the Exchange, On the 20th Day of December, 1823. Baltimore: Published by Edward J. Coale, 1824.