We've all at some point, I'm sure, noticed the novel, "The Dairymaids" prominently displayed in a bookcase in Rob's office. For those who haven't, it's on the wall between his desk and the piano.
My question is, what is the significance, if any, of this book to the show's creators, since it is in so many episodes? Unless I'm mistaken, I'd say that once it was placed, it was never removed from that conspicuous spot for the rest of the series. Any ideas?

I remember someone asking Carl Reiner that and he didn't really have an answer. He said a prop man put it there.