DICKENS, CHARLES. Autograph letter signed ("Charles Dickens") to Mr. Charles Black, apologizing for not being able to dine with him. Devonshire Terrace, 12 April 1850. 2 pages, 8vo, written on recto and verso -- DICKENS. Autograph letter signed ("Charles Dickens") to Mr. Joseph Cartwright, regarding a misunderstanding over arrangements for a charity event Cartwright had organized. Devonshire Terrace, 3 May 1850. One page, 8vo.