Columbia subject headings:
Polk, James K. (James Knox), 1795-1849--Correspondence.
Presidents--United States--Correspondence.
Harvard subject headings:
Polk, James K. (James Knox), 1795-1849--Correspondence.
Presidents--United States--Correspondence
United States--History--1815-1861--Sources.
Princeton subject headings:
Polk, James K. (James Knox), 1795-1849.
Presidents--United States--Correspondence.