"Polk, James Knox." . . . . . . . . . . . . . "Frontier President: James K. Polk"@en . "Juvenile works" . "Juvenile works"@en . "Frontier president, James K. Polk"@en . "A biography of our eleventh President, who previously served as a U.S. Congressman and a Governor of Tennessee." . "A biography of our eleventh President, who previously served as a U.S. Congressman and a Governor of Tennessee."@en . . . "Frontier president : James K. Polk" . . "Frontier president James K. Polk"@en . . .