Columbia subject headings:
Neurosurgeons--Canada--Biography.
Neurosurgeons--United States--Biography.
Penfield, Wilder, 1891-1976.
Harvard subject headings:
Neurosurgeons--Canada--Biography.
Neurosurgeons--United States--Biography
Penfield, Wilder, 1891-1976
Princeton subject headings:
Brain--Surgery--History.
Neurosurgeons--Quebec (Province)--Biography.
Penfield, Wilder, 1891-1976.