Copley, J. (1856). Letters to the Pittsburgh Board of Trade, on the improvement of the Ohio River: By Josiah Copley, esq. Pittsburgh: Published by order of The Board : [Printed at the office of the Morning Post].

Copley, Josiah. Letters to the Pittsburgh Board of Trade, On the Improvement of the Ohio River: By Josiah Copley, Esq. Pittsburgh: Published by order of The Board : [Printed at the office of the Morning Post], 1856.

Copley, Josiah. Letters to the Pittsburgh Board of Trade, On the Improvement of the Ohio River: By Josiah Copley, Esq. Pittsburgh: Published by order of The Board : [Printed at the office of the Morning Post], 1856.