Columbia subject headings:
Environmental health--Ecuador--History--20th century.
Environmental health--Italy--History--20th century.
Epidemiology--Environmental aspects--Research.
Health risk assessment--Ecuador--History--20th century.
Health risk assessment--Italy--History--20th century.
Pollutants--Health aspects--Ecuador--History--20th century.
Pollutants--Health aspects--Italy--History--20th century.
Harvard subject headings:
Environmental health--Ecuador--History--20th century.
Environmental health--Italy--History--20th century.
Epidemiology--Environmental aspects--Research.
Health risk assessment--Ecuador--History--20th century.
Health risk assessment--Italy--History--20th century.
Pollutants--Health aspects--Ecuador--History--20th century.
Pollutants--Health aspects--Italy--History--20th century.
Princeton subject headings:
Environmental health--Ecuador--History--20th century.
Environmental health--Italy--History--20th century.
Epidemiology--Environmental aspects--Research.
Health risk assessment--Ecuador--History--20th century.
Health risk assessment--Italy--History--20th century.
Pollutants--Health aspects--Ecuador--History--20th century.
Pollutants--Health aspects--Italy--History--20th century.