Correspondence between Sir George Cockburn, John W. Croker and Sir John Barrow.
30 letters from Sir George Cockburn to John W. Croker, written between 9 November 1822 and 11 March 1846; Three letters from John W. Croker to Sir George Cockburn, dated 5 April 1833, 26 February 1845 and 1 March 1845; Letter from Sir George Cockburn to Sir John Barrow dated 15 April 1830.