Columbia subject headings:
Lissitzky, El, 1890-1941--Correspondence.
Malevich, Kazimir Severinovich, 1878-1935--Correspondence.
Punin, N. N. (Nikolaĭ Nikolaevich)--Correspondence.
Harvard subject headings:
Art critics--Russia (Federation)--Correspondence.
Artists--Russia (Federation)--Correspondence.
Lissitzky, El, 1890-1941--Correspondence.
Malevich, Kazimir Severinovich, 1878-1935--Correspondence.
Punin, N. N. (Nikolaĭ Nikolaevich)--Correspondence.
Princeton subject headings:
Lissitzky, El, 1890-1941--Correspondence.
Malevich, Kazimir Severinovich, 1878-1935--Correspondence.
Punin, N. N. (Nikolaĭ Nikolaevich)--Correspondence.