Herbert Matter - http://www.adcglobal.org/archive/hof/1976/?id=279
Sandi's great Flickr Collection - http://www.flickr.com/search/?q=knoll&w=22458911%40N07
A l'il info about Knoll - http://www.thedesignencyclopedia.org/knoll
Not forgetting... http://www.knoll.com