Keywords: El Lissitzky - 1o Kestnermappe Proun (Proun. 1st Kestner Portfolio) - Google Art Project.jpg special url_id AgGcCOHX1GEenw PD-old-70 PD-1996 El Lissitzky Google Art Project works by El Lissitzky 1923 lithographs Lithographs of Germany Scottish National Gallery of Modern Art |