Includes the names: J. Betjeman, John Betjeman, John Betjeman, Sir John Betjeman, Sir John Betjeman, L John (Moholy-Nagy Betjeman, Basil Clarke and John Betjeman, Earl of John; Birkenhead Betjeman
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John Betjeman is currently considered a "single author." If one or more works are by a distinct, homonymous authors, go ahead and split the author.
John Betjeman is composed of 9 names. You can examine and separate out names.