Take a 100 page book, get 100 random numbers from that, then do an analysis of the numbers.

First of all, how do you decide right page/left? Likely by generating randomity in your head, which may not be so good. First few pages and last few are unlikely. Probably other things also. For one, words with longer definitions are more likely depending on the exact method.

I don't think using a computer is a very secure solution once your going to that level anyway. Try using dice.