Columbia subject headings:
Flood control--United States--Maps.
Hydroelectric power plants--United States--Maps.
Irrigation--United States--Maps.
Maps.
Nautical charts--United States.
Puerto Rico--Maps.
United States--Maps.
Water resources development--Puerto Rico--Maps.
Water resources development--United States--Maps.
Wild and scenic rivers--United States--Maps.
Harvard subject headings:
Flood control--United States--Maps.
Hydroelectric power plants--United States--Maps.
Inland navigation--United States--Maps.
Irrigation--United States--Maps.
Reservoirs--United States--Maps.
United States--Maps.
Water resources development--Puerto Rico--Maps.
Water resources development--United States--Maps.
Water--United States--Maps.
Wild and scenic rivers--United States--Maps.
Princeton subject headings:
Flood control.
Maps.
United States--Maps.
Water use.
Water-power.
Water-supply.