Columbia subject headings:
Municipal water supply--Economic aspects--Ecuador--Guayaquil.
Municipal water supply--Social aspects--Ecuador--Guayaquil.
Harvard subject headings:
Municipal water supply--Economic aspects--Ecuador--Guayaquil.
Municipal water supply--Social aspects--Ecuador--Guayaquil.
Princeton subject headings:
Municipal water supply--Economic aspects--Ecuador--Guayaquil.
Municipal water supply--Social aspects--Ecuador--Guayaquil.