Columbia subject headings:
Harvard subject headings:
Artists' preparatory studies--Germany--Catalogs.
Friedrich, Caspar David, 1774-1840--Catalogs.
Friedrich, Caspar David, 1774-1840--Criticism and interpretation.
Princeton subject headings:
Friedrich, Caspar David, 1774-1840--Catalogs.
Sepulchral monuments--Germany--Designs and plans--Catalogs.