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Credit
Lectures on general anaesthetics in dentistry : advocating painless dental operations by the use of nitrous oxid, nitrous oxid and oxygen, chloroform analgesia, ethyl chloride and somnoform / by William H. De Ford. Public Domain Mark. Source: Wellcome Collection.
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This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.