Columbia subject headings:
Baths--Italy--Porretta Terme--Early works to 1800.
Mineral waters--Therapeutic use--Italy--Porretta Terme--Early works to 1800.
Porretta Terme (Italy)--Early works to 1800.
Harvard subject headings:
Baths--Italy--Porretta Terme--Early works to 1800.
Hydrotherapy--Early works to 1800.
Mineral waters--Italy--Porretta Terme--Early works to 1800.
Mineral waters--Therapeutic use--Early works to 1800.
Mineral waters--Therapeutic use--Italy--Porretta Terme--Early works to 1800.
Porretta Terme (Italy)--Early works to 1800.
Public baths--Italy--Porretta Terme--Early works to 1800.
Princeton subject headings:
Hydrotherapy--Early works to 1800.
Mineral waters--Italy--Porretta Terme--Early works to 1800.
Mineral waters--Therapeutic use--Early works to 1800.
Public baths--Italy--Porretta Terme--Early works to 1800.