I've been away a very, very long time and don't think I'll have the time to post again for a very, very long time (which means I may not be able to answer replies to this thread... we'll see). However, I thought I'd pass along this information emailed to me by my homeschool group. The first link is the article sent to me, the second is one I found while I was researching the veracity of what I was sent.
(It should be noted that "vintage"/collectible children's books are exempt because the government expects only adults will use them.)