Columbia subject headings:
Harvard subject headings:
Agriculture--Germany--Schleswig-Holstein--History--Pictorial works.
Drainage--Germany--Schleswig-Holstein--History--Pictorial works.
Farm life--Germany--Schleswig-Holstein--History--Pictorial works.
Reclamation of land--Germany--Schleswig-Holstein--History--Pictorial works.
Schleswig-Holstein (Germany)--Rural conditions--Pictorial works.
Princeton subject headings:
Agriculture--Germany--Schleswig-Holstein--History.
Farm life--Germany--Schleswig-Holstein--History.
Schleswig-Holstein (Germany)--Rural conditions.