Letter book with entries dating from 10 August 1833 to 1 April 1836, including letters to John Quincy Adams, President Andrew Jackson, Secretary of State Louis McLane, Secretary of State John Forsyth, Edward Stubbs of the State Department, William Brent, Robert Walsh, Philip Kearny, Senator Peleg Sprague, George Law, William B. Taylor, Felix Cicognani (U.S. Consul at Rome), and John W. Parker (U.S. Consul at Amsterdam).

Letter book with entries dating from 13 May 1848 to 22 April 1850, including letters to Robert Walsh (U.S. Consul, Paris), John Jay, Commodore W.C. Bolton, Daniel J. Carroll, General Jackson Morton, William Carroll, and James Richard; and photographs. Most of the letters have to do with patents, settlement of estates, payment of bills, and the circumstances of the Brent family after the death of John Carroll Brent's father.