I was wandering around and found this post at Zonitics.

Pertinent passage:

I remember watching my mom type her dissertation on a manual typewriter, occasionally sticking in a piece of correction ribbon and typing over a mistake she had just made. After a couple of years' worth of work on her thesis, I came home one day and found her crying. I said, "What's wrong?" She said, "I just finished typing the last page of my dissertation. It's 225 pages." I asked, "What's wrong with that?" She sobbed, "It's only allowed to be 200..."