Columbia subject headings:
Missionaries--Korea--Biography.
Missionaries--United States--Biography.
Underwood, Horace Grant, 1859-1916.
Harvard subject headings:
Missionaries--Korea--Biography
Missionaries--United States--Biography
Underwood, Horace Grant, 1859-1916
Princeton subject headings:
Missionaries--Korea--Biography.
Missionaries--United States--Biography.
Underwood, Horace Grant, 1859-1916.