I didn't pre-generate the books - that would have taken longer than the lifespan of the earth (that didn't stop me from trying, though!). The books are generated by a pseudo-random algorithm which uses the "location" as the seed. So you get random seeming text, but the same page is in the same place every time. I described some of the coding process here: http://libraryofbabel.info/theory4.html
I didn't pre-generate the books - that would have taken longer than the lifespan of the earth (that didn't stop me from trying, though!). The books are generated by a pseudo-random algorithm which uses the "location" as the seed. So you get random seeming text, but the same page is in the same place every time. I described some of the coding process here: http://libraryofbabel.info/theory4.html