. Speech of Mr. Clifford, of Maine, on the resolution of Mr. Campbell, of South Carolina, concerning the New Jersey disputed election. Delivered in the House of Representatives, January 10 and 11, 1839. Washington [D.C.]: Printed at the Globe Office, 1840.
. Speech on the bill to distribute the proceeds of the public lands among the states. [N.p., 1841].
. Speech of Mr. Nathan Clifford, of Maine, on the tariff bill, delivered in the House of Representatives, July 11, 1842. Washington: Globe Office, 1842.
Clifford, Philip G. Nathan Clifford, Democrat, 1803-1881. New York: G.P. Putnams Sons, 1922.