Wells commemorative stamp gains support.
Vogt
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D000766:Anesthesia, Dental / Q000266:history; D000769:Anesthesia, Inhalation / Q000266:history; D049672:History, 19th Century; D049673:History, 20th Century; D009609:Nitrous Oxide / Q000266:history; D010678:Philately
D009609:Nitrous Oxide