Columbia subject headings:
Architecture, Domestic--United States--History--19th century.
Architecture, Domestic--United States--History--20th century.
Country homes--United States--History.
Mansions--United States--History.
United States--Social life and customs--1865-1918.
Harvard subject headings:
Country homes--United States--History.
Country homes--United States--Pictorial works.
United States--Social life and customs--1865-1918
United States--Social life and customs--1918-1945
Upper class--United States--History.
Princeton subject headings:
Country homes--United States--History.
Country homes--United States--Pictorial works.
United States--Social life and customs--1865-1918.
United States--Social life and customs--1918-1945.
Upper class--United States--History.