(1850). Documents relating to the manufacture of iron in Pennsylvania: Published on behalf of the Convention of ironmasters, which met in Philadelphia, on the twentieth of December, 1849. Philadelphia: Published by the General committee.

Documents Relating to the Manufacture of Iron in Pennsylvania: Published On Behalf of the Convention of Ironmasters, Which Met in Philadelphia, On the Twentieth of December, 1849. Philadelphia: Published by the General committee, 1850.

Documents Relating to the Manufacture of Iron in Pennsylvania: Published On Behalf of the Convention of Ironmasters, Which Met in Philadelphia, On the Twentieth of December, 1849. Philadelphia: Published by the General committee, 1850.