Columbia subject headings:
Knaus, Ludwig, 1829-1910--Exhibitions.
Painters--Germany (West)--Biography.
Harvard subject headings:
Knaus, Ludwig, 1829-1910--Exhibitions.
Painters--Germany (West)--Biography.
Princeton subject headings:
Knaus, Ludwig, 1829-1910--Exhibitions.
Painters--Germany (West)--Biography.