Columbia subject headings:
Art thefts--Soviet Union.
Art--Private collections--Soviet Union.
Lissitzky, El, 1890-1941--Art collections.
Lissitzky-Küppers, Sophie, 1891-1978--Art collections.
Harvard subject headings:
Artists' spouses--Soviet Union--Biography.
Exiles--Russia (Federation)--Siberia--Biography
Lissitzky-Küppers, Sophie, 1891-1978--Art collections.
Lissitzky-Küppers, Sophie, 1891-1978.
Women art collectors--Germany--Biography.
Women art collectors--Soviet Union--Biography.
Princeton subject headings: