Columbia subject headings:
Documentary photography--Exhibitions.
National Geographic Society (U.S.)--Photograph collections--Exhibitions.
Travel photography--Exhibitions.
Harvard subject headings:
Documentary photography--Exhibitions
National Geographic Society (U.S.)--Photograph collections--Exhibitions.
Travel photography--Exhibitions
Princeton subject headings:
Documentary photography--Exhibitions.
National Geographic Society (U.S.)--Photograph collections--Exhibitions.
Travel photography--Exhibitions.