Columbia subject headings:
Harvard subject headings:
Merchant marine--Denmark--Syddanmark--History.
Merchant marine--Germany--Schleswig-Holstein--History.
Schleswig-Holstein (Germany)--Economic conditions.
Schleswig-Holstein (Germany)--Social conditions.
Schleswig-Holstein (Germany)--Social life and customs.
Syddanmark (Denmark)--Economic conditions.
Syddanmark (Denmark)--Social conditions.
Syddanmark (Denmark)--Social life and customs.
Princeton subject headings:
Maritime anthropology.
Merchant marine--Denmark--Syddanmark--History.
Merchant marine--Germany--Schleswig-Holstein--History.
Schleswig-Holstein (Germany)--History.
Seafaring life--Denmark--Syddanmark--History.
Seafaring life--Germany--Schleswig-Holstein--History.
Syddanmark (Denmark)--History.