Columbia subject headings:
Art--Private collections--Germany (West)--Catalogs.
Bastian, Heiner, 1942---Art collections--Catalogs.
Twombly, Cy, 1928-2011--Catalogs.
Harvard subject headings:
Art--Private collections--Germany (West)--Catalogs.
Marx, Erich--Art collections--Catalogs.
Twombly, Cy, 1928-2011--Catalogues raisonnés.
Princeton subject headings:
Art--Private collections--Germany (West)--Catalogs.
Bastian, Heiner, 1942---Art collections--Catalogs.
Twombly, Cy, 1928-2011--Catalogs.