Letter to Eichenbald from Ch. Sneyd Edgeworth May 4, 1811
Letter to Charles Babbage, May 22, 1831
Letter to Richard Bentley, November 5, 1848
Letter to Richard Bentley, 24 November, 1836
Letter to Miss Robinson, August 15th, 1783
Letter to John Bowring, May 5, 1822
