Columbia subject headings:
Harvard subject headings:
Cooperation--Germany--North Friesland (Region)
Reclamation of land--Germany--North Friesland (Region)
Shore protection
Special assessments--Germany--North Friesland (Region)
Princeton subject headings:
Cooperation--Germany--North Friesland (Region).
Reclamation of land--Germany--North Friesland (Region).
Shore protection.
Special assessments--Germany--North Friesland (Region).