Columbia subject headings:
Friedrich, Caspar David, 1774-1840.
Nationalgalerie (Germany : West)
Harvard subject headings:
Friedrich, Caspar David, 1774-1840--Catalogs.
Friedrich, Caspar David, 1774-1840.
Nationalgalerie (Germany : West)
Nationalgalerie (Germany : West)--Catalogs.
Princeton subject headings: