<a href='http://www.markholtdesign.com/' >Mark Holt Design</a> updates:

------
Wim Crouwel
Catalogue: Dubuffet, 1960
------
Emil Ruder
Book: Typographie. A Manual of Design, 1967
------
Willem Sandberg
Quadrat-Print: nu 2 , 1968
------
Helmut Schmid
Book: Typography Today , 1980
------
Wolfgang Schmidt
Book: Quadratschnitte, 1966
------
Wolfgang Weingart
Catalogue: International Kunstmesse, 1980
------

oooooh...