Pages 78-80 are the ones that caught my eye. They look as if typed on different typewriters. Notice the difference between page 79 and the other two. In addition, on one page he capitalizes Communist and on the other he does not. A small thing, but still . . .
Pinging you to post #534 at
http://www.freerepublic.com/focus/bloggers/2562507/posts?q=1&;page=533#533
Interesting additional tidbit concerning typewriters, SAD and fonts.