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• A brief biography and description of a collection of his letters to daughter Margaret - http://www.collegeofphysicians.org/FIND_AID/hist/histwwk6.htm

• Encyclopedia of the Neurological Sciences (Second Edition). Describes him as the first neurosurgeon in the US. (abstract available; full article with fee) - http://www.sciencedirect.com/science/article/pii/B9780123851574009295

• "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

• "Historical Profiles: William W. Keen, MD" - http://www.jefferson.edu/university/jmc/departments/surgery/history/keen.html

• "Tells of Operation on Mr. Cleveland" (1917) (abstract available; full article with fee) - http://query.nytimes.com/gst/abstract.html?res=950DE1DA103AE433A25752C2A96F9C946696D6CF

• 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

Thank you, Wordreader ( talk) 05:30, 5 March 2016 (UTC) reply