Lots of reasons to think this was typed on a typewriter. The most important is sentence periods are followed by double spaces. In Microsoft Word, double spaces after periods cause false indents in the following line. Yet twice when false indents should occur, the Killian memos remain lined up on the left.
No doubt the Freepers will howl that the forgery was done on a typewriter, next. Howl, Freepers, howl.