Sold by The Manhattan Rare Book Company:

Letters and books- including an autograph letter by J.R.R. Tolkien and two autograph letters and an autograph note by C.S. Lewis- from the collection of Robert W. Burchfield. [...]
Autograph letter signed by J.R.R. Tolkien to Burchfield dated June 11, 1972 and written from Merton College, apologizing for not returning the book (Kentish Place-Names) he borrowed.

http://www.manhattanrarebooks-literature.com/tolkien_burchfield.htm

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