Columbia subject headings:
Harvard subject headings:
Communicable diseases
Fever--Early works to 1800
Malaria--Early works to 1800.
Marshes
Mosquitoes
Public health laws--Italy--Papal States.
Sanitation
Sanitation--Early works to 1800.
Sanitation--Italy--Papal States--Early works to 1800.
Princeton subject headings:
Water--Pollution--Early works to 1800.
Water--Purification--Early works to 1800.