Columbia subject headings:
Harvard subject headings:
Dams--Early works to 1800.
Dikes (Engineering)--Early works to 1800.
Reclamation of land--Denmark--Early works to 1800.
Reclamation of land--Germany--Early works to 1800.
Shore protection--Early works to 1800.
Princeton subject headings:
Dams--Early works to 1800.
Dikes (Engineering)--Early works to 1800.
Reclamation of land--Denmark--Early works to 1800.
Reclamation of land--Germany--Early works to 1800.
Shore protection--Early works to 1800.