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Credit
Early history of the anaesthetic discovery, or, Painless surgical operations : with letters to and from Sir James Y. Simpson, Dr. Benjamin W. Richardson, and Dr. Henry Bennet : Boston versus Hartford / by Robert Hanham Collyer. Public Domain Mark. Source: Wellcome Collection.
Provider
This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.