Columbia subject headings:
Buildings--Pennsylvania--Philadelphia--Pictorial works.
Historic buildings--Pennsylvania--Philadelphia--Pictorial works.
Philadelphia (Pa.)--Pictorial works.
Harvard subject headings:
Historic buildings--Pennsylvania--Philadelphia--Pictorial works.
Philadelphia (Pa.)--Buildings, structures, etc.--Pictorial works.
Philadelphia (Pa.)--Pictorial works.
Princeton subject headings:
Historic buildings--Pennsylvania--Philadelphia--Pictorial works.
Philadelphia (Pa.)--Buildings, structures, etc.--Pictorial works.
Philadelphia (Pa.)--Pictorial works.