Columbia subject headings:
Harvard subject headings:
Deltas--South Asia--Pictorial works.
Deltas--Southeast Asia--Pictorial works.
Documentary photography
Photojournalism
Water-supply--South Asia--Pictorial works.
Water-supply--Southeast Asia--Pictorial works.
Princeton subject headings:
Deltas--Asia, Southeastern--Pictorial works.
Deltas--South Asia--Pictorial works.
Documentary photography.
Photojournalism.
Water-supply--Asia, Southeastern--Pictorial works.
Water-supply--South Asia--Pictorial works.