Columbia subject headings:
Ackermans, Heinz--Art collections--Catalogs.
Ackermans, Simone--Art collections--Catalogs.
Art, Modern--20th century--Catalogs.
Art--Germany--Kleve (North Rhine-Westphalia)--Catalogs.
Art--Private collections--Germany--Kleve (North Rhine-Westphalia)--Catalogs.
Museum Kurhaus Kleve (Kleve, North Rhine-Westphalia, Germany)--Catalogs.
Harvard subject headings:
Ackermans, Heinz--Art collections--Catalogs.
Ackermans, Simone--Art collections--Catalogs.
Art, Modern--20th century--Catalogs
Museum Kurhaus Kleve (Kleve, North Rhine-Westphalia, Germany)--Catalogs.
Princeton subject headings:
Ackermans, Heinz--Art collections--Catalogs.
Ackermans, Simone--Art collections--Catalogs.
Art, Modern--20th century--Catalogs.
Art--Germany--Kleve (North Rhine-Westphalia)--Catalogs.
Art--Private collections--Germany--Kleve (North Rhine-Westphalia)--Catalogs.
Catalogs.
Museum Kurhaus Kleve (Kleve, North Rhine-Westphalia, Germany)--Catalogs.