Columbia subject headings:
Harvard subject headings:
Baltic Sea--Social life and customs--Pictorial works.
Bathing customs--Baltic Sea--History--20th century.
Baths, Sea--Recreational use--History--20th century--Pictorial works.
Baths--Baltic Sea--History--20th century.
Public baths--Baltic Sea--History--20th century.
Princeton subject headings:
Baltic Sea--Social life and customs--Pictorial works.
Bathing customs--Baltic Sea--History--20th century.
Baths, Sea--Recreational use--History--20th century--Pictorial works.
Baths--Baltic Sea--History--20th century.
Public baths--Baltic Sea--History--20th century.