Columbia subject headings:
Gardner, Isabella Stewart, 1840-1924.
Sargent, John Singer, 1856-1925.
Harvard subject headings:
Gardner, Isabella Stewart, 1840-1924.
Sargent, John Singer, 1856-1925.
Princeton subject headings:
Gardner, Isabella Stewart, 1840-1924.
Sargent, John Singer, 1856-1925.