Columbia subject headings:
Friedrich, Caspar David, 1774-1840.
Hamburger Kunsthalle--Catalogs.
Harvard subject headings:
Friedrich, Caspar David, 1774-1840--Themes, motives.
Hamburger Kunsthalle.
Painting--Germany--Hamburg.
Princeton subject headings:
Friedrich, Caspar David, 1774-1840--Themes, motives.
Hamburger Kunsthalle.
Painting--Germany--Hamburg.