Riddle: In The Letters of J.R.R. Tolkien, Tolkien misspells ...

In The Letters of J.R.R. Tolkien, Tolkien misspells (assuming it was not an editor's error) another author's name. 

Who?

Seth

Twitter: https://twitter.com/SethBTillman ( @SethBTillman ) 

My prior post: Seth Barrett Tillman, My Personal Brexit: Courthouse Security Checks, The New Reform Club (Aug. 7, 2016, 7:33 AM)