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"A man for all seasons: W.W. Keen." Describes his neurosurgical accomplishments. (abstract available; full article with member subscription) - http://www.ncbi.nlm.nih.gov/pubmed/11844249
The surgical operations on President Cleveland in 1893. Keen's own account of the clandestine oral surgery operation he helped perform on President Cleveland. - https://archive.org/details/surgicaloperatio1917keen