Columbia subject headings:
Historic sites--Washington (D.C.)--Pictorial works.
Washington (D.C.)--History--Pictorial works.
Washington (D.C.)--Pictorial works.
Harvard subject headings:
Historic sites--Washington (D.C.)--Pictorial works.
Washington (D.C.)--History--Pictorial works.
Washington (D.C.)--Pictorial works
Princeton subject headings: