Columbia subject headings:
Harvard subject headings:
Health resorts--Delaware River Valley (N.Y.-Del. and N.J.)
Health resorts--New Jersey.
Mineral waters--Delaware River Valley (N.Y.-Del. and N.J.)
Mineral waters--New Jersey.
Princeton subject headings:
Health resorts--Delaware River Valley (N.Y.-Del. and N.J.).
Health resorts--New Jersey.
Mineral waters--Delaware River Valley (N.Y.-Del. and N.J.).
Mineral waters--New Jersey.