Skater,
No problems at all, actually the brown paper worked very well, the books arrived in great shape.
My thought with the bubble wrap was a result of looking at another post that suggested that plain brown paper might not be appropriate for some packages (corner protection, which is probably more of a concern for the more heavier items).
Your wrapping was completely intact, I just had the bubble wrap handy and figured corner protection might be enhanced with it. I suspect that some cardboard on the corners would also suffice.
Regards,
Comanche7