Columbia subject headings:
Archives--Czechoslovakia.
Archives--Germany (East)
Friedrich, Caspar David, 1774-1840--Archives.
Painters--Germany--Biography.
Harvard subject headings:
Friedrich, Caspar David, 1774-1840--Manuscripts.
Princeton subject headings:
Archives--Czechoslovakia.
Archives--Germany (East).
Friedrich, Caspar David, 1774-1840--Archives.
Painters--Germany--Biography.