BURTON, Sir Richard Francis (1821-1890). Autograph letter signed, Athenaeum, 4 April [n.y.] to 'Professor Flower', recommending a geographical publication, 'all you have to do is to consult [the author] personally if there is any ambiguity in his writing', adding 'I would do more for you, but I leave England tomorrow', two pages, 12mo (remnants of guards).