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| | Encyclopedia: Nathan Clifford |
 | | Clifford's son William Henry Clifford was a successful lawyer and an unsuccessful candidate for the Maine state house; his grandson, another Nathan Clifford was also a lawyer and briefly a president of the Maine State Senator. |
 | | Clifford, Philip G., Nathan Clifford, Democrat, 1803-1881, New York: G.P. Putnam s Sons, 1922. |
 | | Nathan Clifford ( August 18, 1803 – July 25, 1881) was an American statesman, diplomat and jurist. |
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