Columbia subject headings:
Philadelphia (Pa.)--Description and travel.
Philadelphia (Pa.)--Social life and customs.
Harvard subject headings:
Lithography, American.
Pennell, Elizabeth Robins, 1855-1936.
Philadelphia (Pa.)--Description and travel.
Philadelphia (Pa.)--Pictorial works.
Philadelphia (Pa.)--Social life and customs.
Princeton subject headings:
Philadelphia (Pa.)--Description and travel.
Philadelphia (Pa.)--Social life and customs.