Columbia subject headings:
Harvard subject headings:
Bathing beaches--Baltic Coast--History--19th century.
Bathing beaches--Baltic Coast--History--20th century.
Bathing customs--Baltic Coast--History--19th century.
Bathing customs--Baltic Coast--History--20th century.
Seaside resorts--Baltic Coast--History--19th century.
Seaside resorts--Baltic Coast--History--20th century.
Princeton subject headings:
Resorts--Baltic Coast--History--19th century.
Resorts--Baltic Coast--History--20th century.