Columbia subject headings:
Anesthesia--History.
Anesthetics--History.
Anesthetics--Therapeutic use.
Ether--Therapeutic use.
Intellectual property--Medicine.
Wells, Horace, 1815-1848.
Harvard subject headings:
Anesthetics--History
Ether.
Nitrous oxide.
Wells, Horace, 1815-1848.
Princeton subject headings: