Columbia subject headings:
Anesthesia--History.
Intellectual property--Medicine.
Morton, W. T. G. (William Thomas Green), 1819-1868.
Wells, Horace, 1815-1848.
Harvard subject headings:
Anesthesia--History
Morton, W. T. G. (William Thomas Green), 1819-1868.
Wells, Horace, 1815-1848.
Princeton subject headings: