Check out this from Robert "Corky" Cartwright, Professor of Computer Science Rice University:
"I am a Professor of Computer Science at Rice University who has followed the evolution of word processing technology over the past 30 years. A cursory glance at the "Killian documents" shows that they are forgeries, the product of a modern word processing system. Even the most powerful word processing systems available in the early 70's were not designed to produce propotionally spaced documents. Moreover, no mechanical typewriter, even with variable letter widths like the IBM Executive typewriter, could produce precise propotional spacing comparable to a modern word processor."
"So in 1971, even the most powerful available computer systems were not equipped to produce documents like the Killian documents."
http://www.freerepublic.com/focus/f-news/1212786/posts
Please read my post # 30 on this --it also has significance.