This slide presentation was originally posted at SquareAmerican.com/ib.htm but is no longer available there. This version was downloaded from DocStoc: http://www.docstoc.com/docs/978371/ibm-online-1975 . I have no other information on its provenance. If you do, please add in the comments!
Updated: I have modified the original entry. Details here: http://wiredpen.com/2011/04/03/thinking-visually-ibm-circa-1975/