Columbia subject headings:
Koester, Alexander, 1864-1932--Catalogs.
Koester, Alexander, 1864-1932.
Painters--Germany--Biography.
Harvard subject headings:
Ducks in art.
Koester, Alexander, 1864-1932--Catalogs.
Koester, Alexander, 1864-1932.
Painters--Germany--Biography.
Princeton subject headings: