I found this facsimile copy of El Lissitzky's suprematist tale of Two Squares in Oxford's Museum of Modern Art while there on a Typography conference in 1990.
First thing to mention: A three day typography conference! My idea of heaven! With talks by the big names of the day: Brody, Why Not Associates, Phil Baines; the always entertaining Eric Spiekermann; the great Ed Benguiat; the amazing Adrian Frutiger; and even the late Stanley Morrison (actually played by an actor). Happy days.
Second thing: Lissitzky was a monumentally important artist, particularly for the graphic design industry, so this iconic book was a great find. Each page has a trace overlay showing the english translation.